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COVER PAGE - shares	6 Months Ended
COVER PAGE - shares	Jun. 30, 2020	Jul. 15, 2020
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Entity Registrant Name	CASELLA WASTE SYSTEMS, INC.
Entity File Number	000-23211
Document Period End Date	Jun. 30, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0000911177
Entity Incorporation, State or Country Code	DE
Entity Filer Category	Large Accelerated Filer
Title of 12(b) Security	Class A common stock, $0.01 par value per share
Trading Symbol	CWST
Security Exchange Name	NASDAQ
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Amendment Flag	false
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Tax Identification Number	03-0338873
Entity Address, Address Line One	25 Greens Hill Lane,
Entity Address, City or Town	Rutland,
Entity Address, State or Province	VT
Entity Address, Postal Zip Code	05701
City Area Code	802
Local Phone Number	775-0325
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		47,382,798
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		988,200

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
CURRENT ASSETS:
Cash and cash equivalents	$ 3,073	$ 3,471
Accounts receivable, net of allowance for credit losses of $2,615 and $1,468, respectively	73,700	80,205
Refundable income taxes	2,228	1,251
Prepaid expenses	9,906	8,994
Inventory	7,938	7,679
Other current assets	1,234	1,213
Total current assets	98,079	102,813
Property, plant and equipment, net of accumulated depreciation and amortization of $879,090 and $844,874, respectively	480,388	443,825
Operating lease right-of-use assets	104,759	108,025
Goodwill	190,966	185,819
Intangible assets, net	60,408	58,721
Restricted assets	1,555	1,586
Cost method investments	11,264	11,264
Deferred income taxes	7,366	8,577
Other non-current assets	12,186	11,552
Total assets	966,971	932,182
CURRENT LIABILITIES:
Current maturities of debt	6,948	4,301
Current operating lease liabilities	8,417	9,356
Accounts payable	57,443	64,396
Accrued payroll and related expenses	9,940	14,375
Accrued interest	1,717	2,041
Contract liabilities	3,056	2,299
Current accrued capping, closure and post-closure costs	9,005	10,223
Other accrued liabilities	32,430	23,598
Total current liabilities	128,956	130,589
Debt, less current portion	527,757	509,021
Operating lease liabilities, less current portion	70,208	70,709
Accrued capping, closure and post-closure costs, less current portion	66,392	61,704
Deferred income taxes	2,576	2,643
Other long-term liabilities	40,337	34,763
COMMITMENTS AND CONTINGENCIES
Casella Waste Systems, Inc. stockholders' equity
Additional paid-in capital	489,193	485,332
Accumulated deficit	(344,133)	(357,016)
Accumulated other comprehensive loss	(14,799)	(6,041)
Total stockholders' equity	130,745	122,753
Total liabilities and stockholders' equity	966,971	932,182
Class A Common Stock
Casella Waste Systems, Inc. stockholders' equity
Common stock	474	468
Class B Common Stock
Casella Waste Systems, Inc. stockholders' equity
Common stock	$ 10	$ 10

CONSOLIDATED BALANCE SHEETS (Parenthetical) $ in Thousands	6 Months Ended	12 Months Ended
CONSOLIDATED BALANCE SHEETS (Parenthetical) $ in Thousands	Jun. 30, 2020 USD ($) vote $ / shares shares	Dec. 31, 2019 USD ($) vote $ / shares shares
Statement of Financial Position [Abstract]
Accounts receivable - trade, allowance for doubtful accounts \| $	$ 2,615	$ 1,468
Accumulated depreciation and amortization \| $	$ 879,090	$ 844,874
Class A Common Stock
Common stock, par value (in dollars per share) \| $ / shares	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	47,382,000	46,803,000
Common stock, shares outstanding	47,382,000	46,803,000
Class B Common Stock
Common stock, par value (in dollars per share) \| $ / shares	$ 0.01	$ 0.01
Common stock, shares authorized	1,000,000	1,000,000
Common stock, shares issued	988,000	988,000
Common stock, shares outstanding	988,000	988,000
Votes per share held \| vote	10	10

CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenues	$ 188,767	$ 187,459	$ 371,676	$ 351,123
Operating expenses:
Cost of operations	123,462	128,674	251,980	246,434
General and administration	24,874	22,145	49,226	44,887
Depreciation and amortization	22,076	19,715	43,482	37,204
Southbridge Landfill closure charge	559	917	1,172	1,472
Expense from acquisition activities	352	464	1,360	1,140
Total operating expenses	171,323	171,915	347,220	331,137
Operating income	17,444	15,544	24,456	19,986
Other expense (income):
Interest income	(45)	(105)	(96)	(222)
Interest expense	5,511	6,155	11,463	12,615
Other income	(492)	(496)	(449)	(711)
Other expense, net	4,974	5,554	10,918	11,682
Income before income taxes	12,470	9,990	13,538	8,304
Provision (benefit) for income taxes	357	(1,925)	466	(1,897)
Net income	$ 12,113	$ 11,915	$ 13,072	$ 10,201
Basic earnings per share attributable to common stockholders:
Weighted average common shares outstanding	48,348	47,464	48,176	46,693
Basic earnings per common share (in dollars per share)	$ 0.25	$ 0.25	$ 0.27	$ 0.22
Diluted earnings per share attributable to common stockholders:
Weighted average common shares outstanding	48,563	48,221	48,411	47,424
Diluted earnings per common share (in dollars per share)	$ 0.25	$ 0.25	$ 0.27	$ 0.22

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 12,113	$ 11,915	$ 13,072	$ 10,201
Hedging activity:
Interest rate swap settlements	(940)	(38)	(1,351)	(66)
Interest rate swap amounts reclassified into interest expense	990	(60)	1,293	(115)
Unrealized loss resulting from changes in fair value of derivative instruments	(1,619)	(2,861)	(8,812)	(4,335)
Other comprehensive loss, before tax	(1,569)	(2,959)	(8,870)	(4,516)
Income tax benefit related to items of other comprehensive loss	0	0	(112)	0
Other comprehensive loss, net of tax	(1,569)	(2,959)	(8,758)	(4,516)
Comprehensive income	$ 10,544	$ 8,956	$ 4,314	$ 5,685

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) (Unaudited) - USD ($) $ in Thousands	Total	Cumulative effect of new accounting principle	Additional Paid-In Capital	Accumulated Deficit	Accumulated Deficit Cumulative effect of new accounting principle	Accumulated other comprehensive loss	Class A Common Stock	Class A Common Stock Common Stock	Class B Common Stock	Class B Common Stock Common Stock
Beginning balance at Dec. 31, 2018	$ (15,832)		$ 373,716	$ (388,669)		$ (1,308)		$ 419		$ 10
Beginning balance (in shares) at Dec. 31, 2018								41,944,000		988,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A common stock - equity offering	100,446		100,410					$ 36
Issuance of Class A common stock - equity offering (in shares)								3,565,000
Issuance of Class A common stock - acquisition	0		(1)					$ 1
Issuance of Class A common stock - acquisition (in shares)								67,000
Issuances of Class A common stock	260		253					$ 7
Issuance of Class A common stock (in shares)								676,000
Stock-based compensation	1,431		1,431
Net income	(1,714)			(1,714)
Hedging activity	(1,557)					(1,557)
Ending balance at Mar. 31, 2019	83,034		475,809	(390,383)		(2,865)		$ 463		$ 10
Ending balance (in shares) at Mar. 31, 2019								46,252,000		988,000
Beginning balance at Dec. 31, 2018	(15,832)		373,716	(388,669)		(1,308)		$ 419		$ 10
Beginning balance (in shares) at Dec. 31, 2018								41,944,000		988,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	10,201
Hedging activity	(4,516)
Ending balance at Jun. 30, 2019	96,197		480,013	(378,468)		(5,824)		$ 466		$ 10
Ending balance (in shares) at Jun. 30, 2019							46,599,000	46,599,000	988,000	988,000
Beginning balance at Mar. 31, 2019	83,034		475,809	(390,383)		(2,865)		$ 463		$ 10
Beginning balance (in shares) at Mar. 31, 2019								46,252,000		988,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuances of Class A common stock	2,318		2,315					$ 3
Issuance of Class A common stock (in shares)								347,000
Stock-based compensation	1,889		1,889
Net income	11,915			11,915
Hedging activity	(2,959)					(2,959)
Ending balance at Jun. 30, 2019	96,197		480,013	(378,468)		(5,824)		$ 466		$ 10
Ending balance (in shares) at Jun. 30, 2019							46,599,000	46,599,000	988,000	988,000
Beginning balance at Dec. 31, 2019	122,753	$ (189)	485,332	(357,016)	$ (189)	(6,041)		$ 468		$ 10
Beginning balance (in shares) at Dec. 31, 2019							46,803,000	46,803,000	988,000	988,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuances of Class A common stock	100		95					$ 5
Issuance of Class A common stock (in shares)								517,000
Stock-based compensation	1,562		1,562
Net income	959			959
Hedging activity	(7,189)					(7,189)
Ending balance at Mar. 31, 2020	117,996		486,989	(356,246)		(13,230)		$ 473		$ 10
Ending balance (in shares) at Mar. 31, 2020								47,320,000		988,000
Beginning balance at Dec. 31, 2019	122,753	$ (189)	485,332	(357,016)	$ (189)	(6,041)		$ 468		$ 10
Beginning balance (in shares) at Dec. 31, 2019							46,803,000	46,803,000	988,000	988,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	13,072
Hedging activity	(8,758)
Ending balance at Jun. 30, 2020	130,745		489,193	(344,133)		(14,799)		$ 474		$ 10
Ending balance (in shares) at Jun. 30, 2020							47,382,000	47,382,000	988,000	988,000
Beginning balance at Mar. 31, 2020	117,996		486,989	(356,246)		(13,230)		$ 473		$ 10
Beginning balance (in shares) at Mar. 31, 2020								47,320,000		988,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Class A common stock - acquisition	0		(1)					$ 1
Issuance of Class A common stock - acquisition (in shares)								36,000
Issuances of Class A common stock	387		387
Issuance of Class A common stock (in shares)								26,000
Stock-based compensation	1,818		1,818
Net income	12,113			12,113
Hedging activity	(1,569)					(1,569)
Ending balance at Jun. 30, 2020	$ 130,745		$ 489,193	$ (344,133)		$ (14,799)		$ 474		$ 10
Ending balance (in shares) at Jun. 30, 2020							47,382,000	47,382,000	988,000	988,000

CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash Flows from Operating Activities:
Net income	$ 13,072	$ 10,201
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	43,482	37,204
Operating lease right-of-use assets expense	4,588	4,921
Interest accretion on landfill and environmental remediation liabilities	3,542	3,579
Amortization of debt issuance costs	1,054	1,149
Stock-based compensation	3,380	3,320
Loss (gain) on sale of property and equipment	131	(327)
Southbridge Landfill non-cash closure charge	41	179
Non-cash expense from acquisition activities	575	(68)
Deferred income taxes	1,256	(1,565)
Changes in assets and liabilities, net of effects of acquisitions and divestitures:
Accounts receivable	6,448	(10,057)
Landfill operating lease contract expenditures	(1,358)	(2,140)
Accounts payable	(6,967)	3,995
Prepaid expenses, inventories and other assets	(2,309)	(2,975)
Accrued expenses, contract liabilities and other liabilities	(7,910)	(12,788)
Net cash provided by operating activities	62,493	38,251
Cash Flows from Investing Activities:
Acquisitions, net of cash acquired	(20,091)	(27,687)
Additions to property, plant and equipment	(51,570)	(46,659)
Proceeds from sale of property and equipment	200	363
Net cash used in investing activities	(71,461)	(73,983)
Cash Flows from Financing Activities:
Proceeds from debt borrowings	91,200	41,400
Principal payments on debt	(82,719)	(109,241)
Payments of debt issuance costs	(11)	0
Proceeds from the exercise of share based awards	100	2,277
Proceeds from the public issuance of Class A Common Stock	0	100,446
Net cash provided by financing activities	8,570	34,882
Net decrease in cash and cash equivalents	(398)	(850)
Cash and cash equivalents, beginning of period	3,471	4,007
Cash and cash equivalents, end of period	3,073	3,157
Cash paid during the period for:
Interest	10,733	11,672
Income taxes, net of refunds	187	16
Supplemental Disclosure of Non-Cash Investing and Financing Activities:
Non-current assets obtained through long-term obligations	11,859	9,333
Landfill
Adjustments to reconcile net income to net cash provided by operating activities:
Operating lease right-of-use assets expense	$ 3,468	$ 3,623

BASIS OF PRESENTATION	6 Months Ended
BASIS OF PRESENTATION	Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
BASIS OF PRESENTATION	BASIS OF PRESENTATION Casella Waste Systems, Inc. (“Parent”), and its consolidated subsidiaries (collectively, “we”, “us” or “our”), is a regional, vertically integrated solid waste services company that provides collection, transfer, disposal, landfill, landfill gas-to-energy, recycling and organics services in the northeastern United States. We market recyclable metals, aluminum, plastics, paper, and corrugated cardboard, which have been processed at our recycling facilities, as well as recyclables purchased from third-parties. Effective January 1, 2020, we reorganized our operations to consist of a single resource-renewal focused operation by combining our larger-scale recycling and commodity brokerage operations along with our organics services and major account and industrial services into our Resource Solutions segment. We continue to manage our solid waste operations on a geographic basis through two regional operating segments, the Eastern and Western regions, each of which provides a full range of solid waste services. Legal, tax, information technology, human resources, certain finance and accounting and other administrative functions are included in our Corporate Entities segment. Segment information reported in the three and six months ended June 30, 2019 and as of December 31, 2019 has been reclassified to conform with the three and six months ended June 30, 2020 and as of June 30, 2020 presentation. The accompanying unaudited consolidated financial statements, which include the accounts of the Parent and our wholly-owned subsidiaries, have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). All significant intercompany accounts and transactions are eliminated in consolidation. Investments in entities in which we do not have a controlling financial interest are accounted for under either the equity method or the cost method of accounting, as appropriate. Our significant accounting policies are more fully discussed in Item 8 of our Annual Report on Form 10-K for the fiscal year ended December 31, 2019, which was filed with the SEC on February 21, 2020. Preparation of our consolidated financial statements in accordance with GAAP requires management to make certain estimates and assumptions. These estimates and assumptions affect the accounting for and recognition and disclosure of assets, liabilities, equity, revenues and expenses. We must make these estimates and assumptions because certain information that we use is dependent on future events, cannot be calculated with a high degree of precision given the available data, or simply cannot be readily calculated. In the opinion of management, these consolidated financial statements include all adjustments, which include normal recurring and nonrecurring adjustments, necessary for a fair presentation of the financial position, results of operations and cash flows for the periods presented. The results for the three and six months ended June 30, 2020 may not be indicative of the results for any other interim period or the entire fiscal year. The consolidated financial statements presented herein should be read in conjunction with our audited consolidated financial statements included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2019. Recent Events With the global outbreak of the novel coronavirus ("COVID-19") and the declaration of a pandemic by the World Health Organization in March 2020, the U.S. Government and all of the states in which we operate have declared the waste services industry as an essential services provider and as a result we are committed to continue to operate and provide our full breadth of services. We have prioritized the safety and well-being of our employees by strictly adhering to recommendations of the Centers for Disease Control and Prevention as well as executive orders of the states in which we operate. The COVID-19 outbreak has caused, and is likely to continue to cause, significant economic disruption across our geographic footprint and has adversely affected, and is expected to continue to adversely affect, our business. COVID-19 negatively impacted our revenues starting at the end of the quarter ended March 31, 2020 as many collection customers required service level changes and volumes into our landfills declined. We did experience improved demand for services in the quarter ended June 30, 2020 as local economies started to reopen as allowed by State Governments. This demand has continued to grow at a fairly steady rate, but our collection and disposal operations remain negatively impacted by lower volumes attributable to COVID-19. We continue to experience increased costs associated with the protection of our employees including costs for additional safety equipment, hygiene products and enhanced facility cleaning. These costs are expected to continue throughout the remainder of the year. We have taken measures to reduce costs in other areas and preserve liquidity during this period of uncertainty. As of the date of this filing, we are unable to determine or predict the nature, duration or scope of the overall impact that COVID-19 will have on our business, results of operations, liquidity and capital resources. Subsequent Events We have evaluated subsequent events or transactions that have occurred after the consolidated balance sheet date of June 30, 2020 through the date of filing of the consolidated financial statements with the SEC on this Quarterly Report on Form 10-Q. We have determined that there are no subsequent events that require disclosure in this Quarterly Report on Form 10-Q.

ACCOUNTING CHANGES

6 Months Ended

Jun. 30, 2020

Accounting Changes and Error Corrections [Abstract]

ACCOUNTING CHANGES

A table providing a brief description of recent Accounting Standards Updates ("ASUs") to the Accounting Standards Codification (“ASC”) issued by the Financial Accounting Standards Board (“FASB”) that we adopted and deemed to have a material impact on our consolidated financial statements based on current account balances and activity follows:

Standard

Description

Effect on the Financial Statements or Other
Significant Matters

Accounting standards adopted effective January 1, 2020

ASU No. 2016-13, as amended through March 2020: Financial Instrument Credit Losses (Topic 326)

Requires that an entity measures all of its expected credit losses for financial assets held based on historical experience, current conditions, and reasonable and supportable forecasts.

We adopted this guidance effective January 1, 2020 using the required modified-retrospective approach. We recognized a cumulative effect adjustment of $(189) to retained earnings upon implementation. This guidance replaces the incurred loss methodology with an expected loss methodology that is referred to as current expected credit loss ("CECL") methodology. CECL requires consideration of past events, current conditions, and reasonable and supportable forecasts about the future to assess credit loss estimates and will generally result in the earlier recognition of an allowance for credit losses. We have updated our business processes and systems and controls to support recognition and disclosure under the new guidance. See Note 5, Accounts Receivable, Net of Allowance for Credit Losses for additional disclosure.

A table providing a brief description of recent ASUs to the ASC issued by the FASB that are pending adoption and deemed to have a possible material impact on our consolidated financial statements based on current account balances and activity follows:

Standard

Description

Effect on the Financial Statements or Other
Significant Matters

Accounting standards issued pending adoption

ASU No. 2020-04: Reference Rate Reform (Topic 848)

Provides temporary optional guidance to ease the potential burden in applying GAAP to contract modifications and hedging relationships, subject to meeting certain criteria, that reference LIBOR or another reference rate expected to be discontinued.

We are currently assessing the provisions of this guidance and do not expect that its adoption will have an impact on our consolidated financial statements and related disclosures. This guidance will be in effect from March 12, 2020 through December 31, 2022.

ASU No. 2019-12: Income Taxes (Topic 740)

Reduces the complexity over accounting for income taxes by removing certain exceptions and amending guidance to improve consistent application of accounting over income taxes.

We are currently assessing the provisions of this guidance to determine whether or not its adoption will have an impact on our consolidated financial statements and related disclosures. This guidance is effective January 1, 2021 with early adoption permitted.

- Definition

The entire disclosure for change in accounting principle. Includes, but is not limited to, nature, reason, and method of adopting amendment to accounting standards or other change in accounting principle.

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-Topic 926
-SubTopic 20
-Section 65
-Paragraph 2
-Subparagraph (f)(3)
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Reference 18: http://www.xbrl.org/2003/role/disclosureRef
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Reference 24: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
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+ Details

REVENUE RECOGNITION

6 Months Ended

Jun. 30, 2020

Revenue from Contract with Customer [Abstract]

REVENUE RECOGNITION

A table of revenues disaggregated by service line and timing of revenue recognition by operating segment for each of the three and six months ended June 30, 2020 and 2019 follows:

Three Months Ended June 30, 2020


	Eastern		Western		Resource Solutions		Total Revenues
Collection	$	37,115	$	58,546	$	—	$	95,661
Landfill	4,568		15,218		—		19,786
Transfer	11,451		9,016		—		20,467
Customer solutions	—		—		20,239		20,239


Recycling	4		332		12,487		12,823


Organics	—		—		15,419		15,419
Transportation	—		3,454		—		3,454


Landfill gas-to-energy	198		720		—		918
Total revenues	$	53,336	$	87,286	$	48,145	$	188,767

Transferred at a point-in-time	$	69	$	367	$	8,231	$	8,667
Transferred over time	53,267		86,919		39,914		180,100
Total revenues	$	53,336	$	87,286	$	48,145	$	188,767

Three Months Ended June 30, 2019


	Eastern		Western		Resource Solutions		Total Revenues
Collection	$	38,955	$	54,151	$	—	$	93,106
Landfill	5,427		18,855		—		24,282
Transfer	11,923		8,597		—		20,520
Customer solutions	—		—		19,216		19,216


Recycling	577		341		10,514		11,432


Organics	—		—		14,905		14,905
Transportation	—		3,287		—		3,287


Landfill gas-to-energy	194		517		—		711
Total revenues	$	57,076	$	85,748	$	44,635	$	187,459

Transferred at a point-in-time	$	52	$	178	$	6,505	$	6,735
Transferred over time	57,024		85,570		38,130		180,724
Total revenues	$	57,076	$	85,748	$	44,635	$	187,459

Six Months Ended June 30, 2020



	Eastern		Western		Resource Solutions		Total Revenues
Collection	$	73,944	$	117,185	$	—	$	191,129
Landfill	8,112		31,528		—		39,640
Transfer	20,834		15,722		—		36,556
Customer solutions	—		—		41,902		41,902


Recycling	6		571		23,453		24,030


Organics	—		—		30,351		30,351
Transportation	—		6,124		—		6,124


Landfill gas-to-energy	583		1,361		—		1,944
Total revenues	$	103,479	$	172,491	$	95,706	$	371,676

Transferred at a point-in-time	$	125	$	602	$	12,692	$	13,419
Transferred over time	103,354		171,889		83,014		358,257
Total revenues	$	103,479	$	172,491	$	95,706	$	371,676

Six Months Ended June 30, 2019



	Eastern		Western		Resource Solutions		Total Revenues
Collection	$	72,919	$	103,746	$	—	$	176,665
Landfill	9,144		34,323		—		43,467
Transfer	20,909		13,872		—		34,781
Customer solutions	—		—		37,370		37,370


Recycling	578		782		21,280		22,640


Organics	—		—		28,501		28,501
Transportation	—		5,852		—		5,852


Landfill gas-to-energy	523		1,324		—		1,847
Total revenues	$	104,073	$	159,899	$	87,151	$	351,123

Transferred at a point-in-time	$	88	$	487	$	12,896	$	13,471
Transferred over time	103,985		159,412		74,255		337,652
Total revenues	$	104,073	$	159,899	$	87,151	$	351,123

Payments to customers that are not in exchange for a distinct good or service are recorded as a reduction of revenues. Rebates to certain customers associated with payments for recycled or organic materials that are received and subsequently processed and sold to other third-parties amounted to $1,546 and $2,537 in the three and six months ended June 30, 2020, respectively, and $1,109 and $2,447 in the three and six months ended June 30, 2019, respectively. Rebates are generally recorded as a reduction of revenues upon the sale of such materials, or upon receipt of the recycled materials at our facilities. We did not record any revenues in the three and six months ended June 30, 2020 and June 30, 2019 from performance obligations satisfied in previous periods.

Contract receivables, which are included in Accounts receivable, net are recorded when billed or when related revenue is earned, if earlier, and represent claims against third-parties that will be settled in cash. Accounts receivable, net includes gross receivables from contracts of $74,091 and $80,191 as of June 30, 2020 and December 31, 2019, respectively. Certain customers are billed in advance and, accordingly, recognition of the related revenues is deferred as a contract liability until the services are provided and control transferred to the customer. We recognized contract liabilities of $3,056 and $2,299 as of June 30, 2020 and December 31, 2019, respectively. Due to the short term nature of advanced billings, substantially all of the deferred revenue recognized as a contract liability as of December 31, 2019 and December 31, 2018 was recognized as revenue during the three and six months ended June 30, 2020 and June 30, 2019, respectively, when the services were performed.

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-URI http://asc.fasb.org/topic&trid=49130388

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Paragraph 12
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130550-203045

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Paragraph 12
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 12
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130558-203045

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 12
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045

+ Details

BUSINESS COMBINATIONS

6 Months Ended

Jun. 30, 2020

Business Combinations [Abstract]

BUSINESS COMBINATIONS

In the six months ended June 30, 2020, we acquired four businesses: three tuck-in solid waste collection businesses in our Western region and one recycling operation in our Resource Solutions segment. In the six months ended June 30, 2019, we acquired three tuck-in solid waste collection businesses in our Eastern region and a business comprised of solid waste collection, transfer and recycling operations in our Western region. The operating results of the acquired businesses are included in the accompanying unaudited consolidated statements of operations from each date of acquisition, and the purchase price has been allocated to the net assets acquired based on fair values at each date of acquisition, with the residual amounts recorded as goodwill. Acquired intangible assets other than goodwill that are subject to amortization include client lists and non-compete covenants. Such assets are amortized over a five to ten year period from the date of acquisition. All amounts recorded to goodwill are expected to be deductible for tax purposes.

A summary of the purchase price paid for these acquisitions and the allocation of the purchase price for these acquisitions follows:


	Six Months Ended June 30,
	2020		2019
Purchase Price:
Cash used in acquisitions, net of cash acquired	$	19,212	$	25,546
Notes payable	—		2,250


Contingent consideration and holdbacks	2,837		1,120
Total	22,049		28,916
Allocated as follows:
Current assets	132		1,865

Land	685		726
Buildings	2,118		2,602
Equipment	8,277		8,655
Intangible assets	5,912		11,619
Other liabilities, net	(222)		(1,546)
Deferred tax liability	—		(2,137)
Fair value of assets acquired and liabilities assumed	16,902		21,784
Excess purchase price allocated to goodwill	$	5,147	$	7,132

Certain purchase price allocations are preliminary and are based on information existing at the acquisition dates or upon closing the transaction. Accordingly, these purchase price allocations are subject to change. Unaudited pro forma combined information that shows our operational results as though each acquisition completed since the beginning of the prior fiscal year had occurred as of January 1, 2019 is as follows:


	Three Months Ended June 30,						Six Months Ended June 30,
	2020		2019		2020		2019
Revenues	$	189,026	$	201,608	$	373,623	$	381,518
Operating income	$	17,448	$	16,850	$	24,517	$	22,751
Net income	$	12,115	$	12,629	$	13,087	$	11,709

Basic earnings per share attributable to common stockholders:
Weighted average common shares outstanding	48,348		47,464		48,176		46,693
Basic earnings per common share	$	0.25	$	0.27	$	0.27	$	0.25
Diluted earnings per share attributable to common stockholders:
Weighted average common shares outstanding	48,563		48,221		48,411		47,424
Diluted earnings per common share	$	0.25	$	0.26	$	0.27	$	0.25

The unaudited pro forma results set forth in the table above have been prepared for comparative purposes only and are not necessarily indicative of the actual results of operations had the acquisitions occurred as of January 1, 2019 or of the results of our future operations. Furthermore, the unaudited pro forma results do not give effect to all cost savings or incremental costs that may occur as a result of the integration and consolidation of the completed acquisitions.

ACCOUNTS RECEIVABLE, NET OF ALLOWANCE FOR CREDIT LOSSES

6 Months Ended

Jun. 30, 2020

Credit Loss [Abstract]

ACCOUNTS RECEIVABLE, NET OF ALLOWANCE FOR CREDIT LOSSES

Accounts receivable represent receivables from customers for collection, transfer, recycling, disposal and other services. Our accounts receivable are recorded when billed or when related revenue is earned, if earlier, and represent claims against third-parties that will be settled in cash. The carrying value of our accounts receivable, net of allowance for credit losses represents its estimated net realizable value. Estimates are used in determining our allowance for credit losses based on, among other things, our historical loss trends, the age of outstanding accounts receivable, and current and expected economic conditions. Additions – charged to expense in the six months ended June 30, 2020 considers the current economic conditions associated with the COVID-19 pandemic and the potential impact to our customers’ ability to pay for services that we have provided. Our reserve is evaluated and revised on a monthly basis. Past due accounts receivable are written off when deemed to be uncollectible.

A summary of the changes to allowance for credit losses follows:


	Six Months Ended June 30, 2020
Balance at beginning of period	$	1,468
Cumulative effect of new accounting principle	189
Additions - charged to expense	1,697
Deductions - bad debts written off, net of recoveries	(739)
Balance at end of period	$	2,615

- Definition

The entire disclosure for credit loss on financial instrument measured at amortized cost basis, net investment in lease, off-balance sheet credit exposure, and available-for-sale debt security.

+ References + Details

LEASES

6 Months Ended

Jun. 30, 2020

Leases [Abstract]

LEASES

We are also party to three landfill operation and management agreements. These agreements are long-term landfill operating contracts with government bodies whereby we receive tipping revenue, pay normal operating expenses and assume future final capping, closure and post-closure obligations. The government body retains ownership of the landfill. There is no bargain purchase option and title to the property does not pass to us at the end of the lease term. We allocate the consideration paid to the landfill airspace rights and underlying land lease based on the relative fair values. In addition to up-front or one-time payments, the landfill operating agreements may require us to make future minimum rental payments, including success/expansion fees, other direct costs and final capping, closure and post-closure costs. The value of all future minimum rental payments is amortized and charged to cost of operations over the life of the contract. We amortize the consideration allocated to airspace rights as airspace is utilized on a units-of-consumption basis and such amortization is charged to cost of operations as airspace is consumed (e.g., as tons are placed into the landfill). The underlying value of any land lease is amortized to cost of operations on a straight-line basis over the estimated life of the operating agreement.

A schedule of lease costs and other lease information follows:


	Three Months Ended June 30,						Six Months Ended June 30,
	2020		2019		2020		2019
Lease cost:
Amortization of right-of-use assets	$	859	$	503	$	1,591	$	912
Interest expense	290		186		536		342
Fixed lease cost - vehicles, equipment and property	2,171		2,342		4,588		4,921
Fixed lease cost - landfill operating leases	1,795		1,975		3,468		3,623
Fixed lease cost	3,966		4,317		8,056		8,544
Short-term lease cost	729		1,092		1,658		1,750
Variable lease cost	129		35		261		42
Total lease cost	$	5,973	$	6,133	$	12,102	$	11,590

Other information:
Cash paid for amounts included in the measurement of lease liabilities:
Financing cash flows for finance leases	$	981	$	733	$	1,942	$	1,204
Operating cash flows for operating leases	$	3,272	$	4,831	$	5,714	$	6,874
Right-of-use assets obtained in exchange for new finance lease liabilities	$	5,391	$	4,384	$	11,793	$	6,857
Right-of-use assets obtained in exchange for new operating lease liabilities	$	776	$	173	$	3,142	$	588

							June 30, 2020
Weighted-average remaining lease term - finance leases (years)									6.1
Weighted-average remaining lease term - operating leases (years)									11.8
Weighted-average discount rate - finance leases									4.6	%
Weighted-average discount rate - operating leases									5.1	%

Estimated minimum future lease obligations are as follows:


	Operating Leases		Finance Leases
Fiscal year ending December 31, 2020	$	7,512	$	2,928
Fiscal year ending December 31, 2021	12,145		5,706
Fiscal year ending December 31, 2022	9,486		5,113
Fiscal year ending December 31, 2023	7,296		4,947
Fiscal year ending December 31, 2024	6,638		4,847
Thereafter	63,964		9,778
Total lease payments	107,041		33,319
Less: interest expense	(28,416)		(5,056)
Lease liability balance	$	78,625	$	28,263

LEASES

A schedule of lease costs and other lease information follows:


	Three Months Ended June 30,						Six Months Ended June 30,
	2020		2019		2020		2019
Lease cost:
Amortization of right-of-use assets	$	859	$	503	$	1,591	$	912
Interest expense	290		186		536		342
Fixed lease cost - vehicles, equipment and property	2,171		2,342		4,588		4,921
Fixed lease cost - landfill operating leases	1,795		1,975		3,468		3,623
Fixed lease cost	3,966		4,317		8,056		8,544
Short-term lease cost	729		1,092		1,658		1,750
Variable lease cost	129		35		261		42
Total lease cost	$	5,973	$	6,133	$	12,102	$	11,590

Other information:
Cash paid for amounts included in the measurement of lease liabilities:
Financing cash flows for finance leases	$	981	$	733	$	1,942	$	1,204
Operating cash flows for operating leases	$	3,272	$	4,831	$	5,714	$	6,874
Right-of-use assets obtained in exchange for new finance lease liabilities	$	5,391	$	4,384	$	11,793	$	6,857
Right-of-use assets obtained in exchange for new operating lease liabilities	$	776	$	173	$	3,142	$	588

							June 30, 2020
Weighted-average remaining lease term - finance leases (years)									6.1
Weighted-average remaining lease term - operating leases (years)									11.8
Weighted-average discount rate - finance leases									4.6	%
Weighted-average discount rate - operating leases									5.1	%

Estimated minimum future lease obligations are as follows:


	Operating Leases		Finance Leases
Fiscal year ending December 31, 2020	$	7,512	$	2,928
Fiscal year ending December 31, 2021	12,145		5,706
Fiscal year ending December 31, 2022	9,486		5,113
Fiscal year ending December 31, 2023	7,296		4,947
Fiscal year ending December 31, 2024	6,638		4,847
Thereafter	63,964		9,778
Total lease payments	107,041		33,319
Less: interest expense	(28,416)		(5,056)
Lease liability balance	$	78,625	$	28,263

GOODWILL AND INTANGIBLE ASSETS

6 Months Ended

Jun. 30, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND INTANGIBLE ASSETS

A summary of the activity and balances related to goodwill by reporting segment is as follows:


	December 31, 2019		Acquisitions		June 30, 2020
Eastern region	$	30,720	$	—	$	30,720
Western region	141,055		5,147		146,202
Resource solutions	14,044		—		14,044

Total	$	185,819	$	5,147	$	190,966

A summary of intangible assets by intangible asset type follows:


	Covenants Not-to-Compete		Client Lists		Total
Balance, June 30, 2020
Intangible assets	$	26,652	$	76,635	$	103,287
Less accumulated amortization	(19,756)		(23,123)		(42,879)
	$	6,896	$	53,512	$	60,408


	Covenants Not-to-Compete		Client Lists		Total
Balance, December 31, 2019
Intangible assets	$	26,162	$	71,122	$	97,284
Less accumulated amortization	(18,968)		(19,595)		(38,563)
	$	7,194	$	51,527	$	58,721

Intangible amortization expense was $2,222 and $4,316 during the three and six months ended June 30, 2020, respectively, as compared to $1,639 and $3,039 during the three and six months ended June 30, 2019, respectively.

A summary of intangible amortization expense estimated for the five fiscal years following the fiscal year ended December 31, 2019 and thereafter follows:



Estimated Future Amortization Expense as of June 30, 2020
Fiscal year ending December 31, 2020	$	4,441
Fiscal year ending December 31, 2021	$	7,500
Fiscal year ending December 31, 2022	$	6,848
Fiscal year ending December 31, 2023	$	6,640
Fiscal year ending December 31, 2024	$	7,603
Thereafter	$	27,376

ACCRUED FINAL CAPPING, CLOSURE AND POST CLOSURE

6 Months Ended

Jun. 30, 2020

Asset Retirement Obligation Disclosure [Abstract]

ACCRUED FINAL CAPPING, CLOSURE AND POST CLOSURE

ACCRUED FINAL CAPPING, CLOSURE AND POST CLOSUREAccrued final capping, closure and post-closure costs include the current and non-current portion of costs associated with obligations for final capping, closure and post-closure of our landfills. We estimate our future final capping, closure and post-closure costs in order to determine the final capping, closure and post-closure expense per ton of waste placed into each landfill. The anticipated time frame for paying these costs varies based on the remaining useful life of each landfill as well as the duration of the post-closure monitoring period.

A summary of the changes to accrued final capping, closure and post-closure liabilities follows:


	Six Months Ended June 30,
	2020		2019
Beginning balance	$	71,927	$	73,075
Obligations incurred	1,764		1,217
Revision in estimates (1)	152		—
Accretion expense	3,204		3,194

Obligations settled (2)	(1,650)		(2,947)
Ending balance	$	75,397	$	74,539

(1)Relates to changes in estimated costs and timing of final capping, closure and post-closure activities at the Town of Southbridge, Massachusetts landfill ("Southbridge Landfill"). See Note 10, Commitments and Contingencies and Note 13, Other Items and Charges for further discussion.

(2)Includes amounts that are being processed through accounts payable as a part of our disbursements cycle.

DEBT

6 Months Ended

Jun. 30, 2020

Debt And Derivatives Disclosure [Abstract]

DEBT

A summary of debt is as follows:


	June 30, 2020		December 31, 2019
Senior Secured Credit Facility:
Revolving line of credit facility ("Revolving Credit Facility") due May 2023; bearing interest at LIBOR plus 1.75%	$	37,700	$	26,900
Term loan A facility ("Term Loan Facility") due May 2023; bearing interest at LIBOR plus 1.75%	350,000		350,000

Tax-Exempt Bonds:
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014 ("New York Bonds 2014") due December 2044 - fixed rate interest period through 2019; bearing interest at 2.875%	25,000		25,000
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014R-2 ("New York Bonds 2014R-2") due December 2044 - fixed rate interest period through 2026; bearing interest at 3.125%	15,000		15,000
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-3 ("FAME Bonds 2005R-3") due January 2025 - fixed rate interest period through 2025; bearing interest at 5.25%	25,000		25,000
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2015R-1 ("FAME Bonds 2015R-1") due August 2035 - fixed rate interest period through 2025; bearing interest at 5.125%	15,000		15,000
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2015R-2 ("FAME Bonds 2015R-2") due August 2035 - fixed rate interest period through 2025; bearing interest at 4.375%	15,000		15,000
Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2013 ("Vermont Bonds") due April 2036 - fixed rate interest period through 2028; bearing interest at 4.625%	16,000		16,000
Business Finance Authority of the State of New Hampshire Solid Waste Disposal Revenue Bonds Series 2013 ("New Hampshire Bonds") due April 2029 - fixed rate interest period through 2029; bearing interest at 2.95%	11,000		11,000
Other:
Finance leases maturing through December 2107; bearing interest at a weighted average of 4.6%	28,263		18,364
Notes payable maturing through June 2027; bearing interest at a weighted average of 3.5%	5,104		5,464
Principal amount of debt	543,067		522,728
Less—unamortized debt issuance costs (1)	8,362		9,406
Debt less unamortized debt issuance costs	534,705		513,322
Less—current maturities of debt	6,948		4,301
	$	527,757	$	509,021

(1)A summary of unamortized debt issuance costs by debt instrument follows:


	June 30, 2020		December 31, 2019
Revolving Credit Facility and Term Loan Facility (collectively, the "Credit Facility")	$	4,659	$	5,478
New York Bonds 2014	1,034		1,057
New York Bonds 2014R-2	359		390
FAME Bonds 2005R-3	389		432
FAME Bonds 2015R-1	517		552
FAME Bonds 2015R-2	380		417
Vermont Bonds	514		541
New Hampshire Bonds	510		539
	$	8,362	$	9,406

Credit Facility

As of June 30, 2020, we are party to a credit agreement ("Credit Agreement"), which provides for a $350,000 Term Loan Facility and a $200,000 Revolving Credit Facility. We have the right to request, at our discretion, an increase in the amount of loans under the Credit Facility by an aggregate amount of $125,000, subject to the terms and conditions set forth in the Credit Agreement.

The Credit Facility has a 5-year term that matures in May 2023 and bears interest at a rate of LIBOR plus 1.75% per annum, which will be reduced to a rate of LIBOR plus as low as 1.25% upon us reaching a consolidated net leverage ratio of less than 2.25x. The Credit Facility is guaranteed jointly and severally, fully and unconditionally by all of our significant wholly-owned subsidiaries and secured by substantially all of our assets. As of June 30, 2020, further advances were available under the Credit Facility in the amount of $135,875. The available amount is net of outstanding irrevocable letters of credit totaling $26,425, at which date no amount had been drawn.

The Credit Agreement requires us to maintain a minimum interest coverage ratio and a maximum consolidated net leverage ratio, to be measured at the end of each fiscal quarter. As of June 30, 2020, we were in compliance with the covenants contained in the Credit Agreement. In addition to these financial covenants, the Credit Agreement also contains a number of important customary affirmative and negative covenants which restrict, among other things, our ability to sell assets, incur additional debt, create liens, make investments, and pay dividends. We do not believe that these restrictions impact our ability to meet future liquidity needs. An event of default under any of our debt agreements could permit some of our lenders, including the lenders under the Credit Facility, to declare all amounts borrowed from them to be immediately due and payable, together with accrued and unpaid interest, or, in the case of the Credit Facility, terminate the commitment to make further credit extensions thereunder, which could, in turn, trigger cross-defaults under other debt obligations. If we were unable to repay debt to our lenders, or were otherwise in default under any provision governing our outstanding debt obligations, our secured lenders could proceed against us and against the collateral securing that debt.

Cash Flow Hedges

Our strategy to reduce exposure to interest rate risk involves entering into interest rate derivative agreements to hedge against adverse movements in interest rates related to the variable rate portion of our long-term debt. In the six months ended June 30, 2020, we entered into three forward starting interest rate derivative agreements with a total notional amount of $60,000 that will serve to replace existing interest rate derivative agreements upon their expiration between June 2022 and May 2023. In the six months ended June 30, 2020, we also amended three interest rate derivative agreements to settle each of the 1.0% floors and replace each with a 0.0% floor in line with our Term Loan Facility, which resulted in us dedesignating the original hedging relationships. We subsequently designated new hedging relationships between the three interest rate derivative agreements and the variable rate interest payments related to the Term Loan Facility based on a quantitative assessment that was performed using regression analysis, which indicated that the hedging relationships were highly effective. Because the interest rate payments associated with the variable rate portion of our long-term debt will still occur, the net loss of $(765) associated with the dedesignated interest rate derivative agreements and the $430 cash settlement received in exchange for settling the 1.0% floors in accumulated other comprehensive loss were not reclassified into earnings. Instead, this loss and settlement amount will continue to be reclassified from accumulated other comprehensive loss into interest expense as the interest payments affect earnings.

As of both June 30, 2020 and December 31, 2019, our interest rate derivative agreements have a total notional amount of $190,000. According to the terms of the agreements, we receive interest based on the 1-month LIBOR index and pay interest at a weighted average rate of approximately 2.54%. The agreements mature between February 2021 and May 2023.

Additionally, we have forward starting interest rate derivative agreements with a total notional amount of $125,000 that mature between February 2026 and May 2028. We receive interest based on the 1-month LIBOR index, restricted by a 0.0% floor, and will pay interest at a weighted average rate of approximately 1.63%.

We have designated these derivative instruments as highly effective cash flow hedges, and therefore the change in fair value is recorded in our stockholders’ equity as a component of accumulated other comprehensive loss and included in interest expense at the same time as interest expense is affected by the hedged transactions. Differences paid or received over the life of the agreements are recorded as additions to or reductions of interest expense on the underlying debt and included in cash flows from operating activities.

A summary of the effect of cash flow hedges related to derivative instruments on the consolidated balance sheet follows:


		Fair Value
	Balance Sheet Location	June 30, 2020		December 31, 2019




Interest rate swaps	Other accrued liabilities	$	4,636	$	1,824
Interest rate swaps	Other long-term liabilities	9,962		3,603
		$	14,598	$	5,427

Interest rate swaps	Accumulated other comprehensive loss	$	(14,799)	$	(5,929)
Interest rate swaps - tax provision	Accumulated other comprehensive loss	—		(112)
		$	(14,799)	$	(6,041)

A summary of the amount of expense on cash flow hedging relationships related to interest rate swaps reclassified from accumulated other comprehensive loss into earnings follows:


	Three Months Ended June 30,						Six Months Ended June 30,
	2020		2019		2020		2019
Statement of Operations Location	(Expense) Income						(Expense) Income
Interest expense	$	(990)	$	60	$	(1,293)	$	115

COMMITMENTS AND CONTINGENCIES

6 Months Ended

Jun. 30, 2020

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

Legal Proceedings

In the ordinary course of our business and as a result of the extensive governmental regulation of the solid waste industry, we are subject to various judicial and administrative proceedings involving state and local agencies. In these proceedings, an agency may seek to impose fines or to revoke or deny renewal of an operating permit held by us. From time to time, we may also be subject to actions brought by special interest or other groups, adjacent landowners or residents in connection with the permitting and licensing of landfills and transfer stations, or allegations of environmental damage or violations of the permits and licenses pursuant to which we operate. In addition, we may be named defendants in various claims and suits pending for alleged damages to persons and property, alleged violations of certain laws and alleged liabilities arising out of matters occurring during the ordinary operation of a waste management business.

In accordance with FASB ASC 450 - Contingencies, we accrue for legal proceedings, inclusive of legal costs, when losses become probable and reasonably estimable. As of the end of each applicable reporting period, we review each of our legal proceedings to determine whether it is probable, reasonably possible or remote that a liability has been incurred and, if it is at least reasonably possible, whether a range of loss can be reasonably estimated under the provisions of FASB ASC 450-20. In instances where we determine that a loss is probable and we can reasonably estimate a range of loss we may incur with respect to such a matter, we record an accrual for the amount within the range that constitutes our best estimate of the possible loss. If we are able to reasonably estimate a range, but no amount within the range appears to be a better estimate than any other, we record an accrual in the amount that is the low end of such range. When a loss is reasonably possible, but not probable, we will not record an accrual, but we will disclose our estimate of the possible range of loss where such estimate can be made in accordance with FASB ASC 450-20.

Environmental Remediation Liability (including related litigation)

We are subject to liability for environmental damage, including personal injury and property damage, that our solid waste, recycling and power generation facilities may cause to neighboring property owners, particularly as a result of the contamination of drinking water sources or soil, possibly including damage resulting from conditions that existed before we acquired the facilities. We may also be subject to liability for similar claims arising from off-site environmental contamination caused by pollutants or hazardous substances if we or our predecessors arrange or arranged to transport, treat or dispose of those materials. The following matters represent our material outstanding claims.

Southbridge Recycling & Disposal Park, Inc.

In October 2015, our Southbridge Recycling and Disposal Park, Inc. (“SRD”) subsidiary reported to the Massachusetts Department of Environmental Protection (“MADEP”) results of analysis of samples collected pursuant to our existing permit from private drinking water wells located near the Town of Southbridge, Massachusetts (“Town”) Landfill (“Southbridge Landfill”), which was operated by SRD and later closed in November 2018 when Southbridge Landfill reached its final capacity. Those results indicated the presence of contaminants above the levels triggering notice and response obligations under MADEP regulations. In response to those results, we have carried out an Immediate Response Action pursuant to Massachusetts General Law Chapter 21E (the "Charlton 21E Obligations") pursuant to state law. Further, we implemented a plan to analyze and better understand the groundwater near the Southbridge Landfill and we investigated with the objective of identifying the source or sources of the elevated levels of contamination measured in the well samples. If it is determined that some or all of the contamination originated at the Southbridge Landfill, we will work with the Town (the Southbridge Landfill owner and the former operator of an unlined portion of the Southbridge Landfill, which was used prior to our operation of a double-lined portion of the Southbridge Landfill commencing in 2004) to evaluate and allocate the liabilities related to the Charlton 21E Obligations. In July 2016, we sent correspondence to the Town pursuant to Chapter 21E of Massachusetts General Laws demanding that the Town reimburse us for the environmental response costs we had spent and that the Town be responsible for all such costs in the future, as well as any other costs or liabilities resulting from the release of contaminants from the unlined portion of the Southbridge Landfill. The Town responded in September 2016, denying that the Southbridge Landfill is the source of such contamination, and claiming that if it is, that we may owe an indemnity to the Town pursuant to the Operating Agreement between us and the Town dated May 29, 2007, as amended. We entered into a Tolling Agreement with the Town to delay any further administrative or legal actions until our work with MADEP more specifically defines the parties’ responsibilities for the Charlton 21E Obligations, if any. Please see below for further discussion of our relationship with the Town regarding the Charlton 21E Obligations.

In February 2016, we and the Town received a Notice of Intent to Sue under the Resource Conservation and Recovery Act ("RCRA") from a law firm purporting to represent residents proximate to the Southbridge Landfill (“Residents”), indicating its intent to file suit against us on behalf of the Residents alleging the groundwater contamination originated from the Southbridge Landfill. In February 2017, we received an additional Notice of Intent to Sue from the National Environmental Law Center under the Federal Clean Water Act ("CWA") and RCRA (collectively the “Acts”) on behalf of Environment America, Inc., d/b/a Environment Massachusetts, and Toxics Action Center, Inc., which have referred to themselves as the Citizen Groups. The Citizen Groups alleged that we had violated the Acts, and that they intended to seek appropriate relief in federal court for those alleged violations. On or about June 9, 2017, a lawsuit was filed against us, SRD and the Town in the United States District Court for the District of Massachusetts (the “Massachusetts Court”) by the Citizen Groups and the Residents alleging violations of the Acts (the “Litigation”), and demanding a variety of remedies under the Acts, including fines, remediation, mitigation and costs of litigation, and remedies for violations of Massachusetts civil law related to personal and property damages, including remediation, diminution of property values, compensation for lost use and enjoyment of properties, enjoinment of further operation of the Southbridge Landfill, and costs of litigation, plus interest on any damage award, on behalf of the Residents. We believe the Litigation to be factually inaccurate, and without legal merit, and we and SRD are vigorously defending the Litigation. Nevertheless, we believe it is reasonably possible that a loss will occur as a result of the Litigation although an estimate of loss cannot be reasonably provided at this time. We also continue to believe the Town should be responsible for costs or liabilities associated with the Litigation relative to alleged contamination originating from the unlined portion of the Southbridge Landfill, although there can be no assurance that we will not be required to incur some or all of such costs and liabilities.

In December 2017, we filed a Motion to Dismiss the Litigation, and on October 1, 2018, the Massachusetts Court granted our Motion to Dismiss, and accordingly, dismissed the Citizen Groups claims under the Acts. The Massachusetts Court has retained jurisdiction of the Residents claims. The Citizen Groups intend to appeal the Massachusetts Court’s decision to grant our Motion to Dismiss. The Residents moved for a stay of their case until the Citizen Groups appealed. We opposed the stay and in March 2019, the Massachusetts Court denied the Residents motion for a stay. We are in active discovery in the Residents case.

We entered into an Administrative Consent Order on April 26, 2017 (the “ACO”), with MADEP, the Town, and the Town of Charlton, committing us to equally share the costs with MADEP, of up to $10,000 ($5,000 each) for the Town to install a municipal waterline in the Town of Charlton ("Waterline"). Upon satisfactory completion of that Waterline, and other matters covered by the ACO, we and the Town will be released by MADEP from any future responsibilities for the Charlton 21E Obligations. We also entered into an agreement with the Town on April 28, 2017 entitled the “21E Settlement and Water System Construction Funding Agreement” (the “Waterline Agreement”), wherein we and the Town released each other from claims arising from the Charlton 21E Obligations. Pursuant to the Waterline Agreement, the Town has issued a twenty (20) year bond for our portion of the Waterline costs in the amount of $4,089. We have agreed to reimburse the Town for periodic payments under such bond. Construction of the Waterline is complete and homeowners are relying on municipal water supply. Remaining aspects of the project are minor and are expected to be completed in 2020. Bond reimbursement to the Town commenced in the quarter ended June 30, 2020.

We have recorded an environmental remediation liability related to our obligation associated with the installation of the Waterline in other accrued liabilities and other long-term liabilities. We inflate the estimated costs in current dollars to the expected time of payment and discount the total cost to present value using a risk-free interest rate of 2.6%. Our expenditures could be significantly higher if costs exceed estimates.

A summary of the changes to the environmental remediation liability associated with the Southbridge Landfill follows:



	Six Months Ended June 30,
	2020		2019
Beginning balance	$	4,596	$	5,173
Accretion expense	62		65
Obligations incurred	28		—
Revisions in estimates (1)	(188)		—
Obligations settled (2)	(293)		(392)
Ending balance	$	4,205	$	4,846

(1)The revision of estimate is associated with the completion of the environmental remediation at the site. See Note 13, Other Items and Charges to our consolidated financial statements for further discussion.

(2)Includes amounts that are being processed through accounts payable as a part of our disbursements cycle.

We completed the first phase of landfill capping and closure in the fiscal year ended December 31, 2019 at the Southbridge Landfill and are actively seeking approval from MADEP to close and cap the remainder of the landfill.

The costs and liabilities we may be required to incur in connection with the foregoing Southbridge Landfill matters could be material to our results of operations, our cash flows and our financial condition.

Potsdam Environmental Remediation Liability

On December 20, 2000, the State of New York Department of Environmental Conservation (“DEC”) issued an Order on Consent (“Order”) which named Waste-Stream, Inc. (“WSI”), our subsidiary, General Motors Corporation (“GM”) and Niagara Mohawk Power Corporation (“NiMo”) as Respondents. The Order required that the Respondents undertake certain work on a 25-acre scrap yard and solid waste transfer station owned by WSI in Potsdam, New York, including the preparation of a Remedial Investigation and Feasibility Study (“Study”). A draft of the Study was submitted to the DEC in January 2009 (followed by a final report in May 2009). The Study estimated that the undiscounted costs associated with implementing the preferred remedies would be approximately $10,219. On February 28, 2011, the DEC issued a Proposed Remedial Action Plan for the site and accepted public comments on the proposed remedy through March 29, 2011. We submitted comments to the DEC on this matter. In April 2011, the DEC issued the final Record of Decision (“ROD”) for the site. The ROD was subsequently rescinded by the DEC for failure to respond to all submitted comments. The preliminary ROD, however, estimated that the present cost associated with implementing the preferred remedies would be approximately $12,130. The DEC issued the final ROD in June 2011 with proposed remedies consistent with its earlier ROD. An Order on Consent and Administrative Settlement naming WSI and NiMo as Respondents was executed by the Respondents and DEC with an effective date of October 25, 2013. On January 29, 2016, a Cost-Sharing Agreement was executed between WSI, NiMo, Alcoa Inc. (“Alcoa”) and Reynolds Metal Company (“Reynolds”) whereby Alcoa and Reynolds elected to voluntarily participate in the onsite remediation activities at a combined 15% participant share. The majority of the remediation work has been completed as of June 30, 2020. WSI is jointly and severally liable with NiMo, Alcoa and Reynolds for the total cost to remediate.

We have recorded an environmental remediation liability associated with the Potsdam site based on incurred costs to date and estimated costs to complete the remediation in other accrued liabilities and other long-term liabilities. We inflate the estimated costs in current dollars to the expected time of payment and discount the total cost to present value using a risk-free interest rate of 1.5%. The environmental remediation liability associated with the Potsdam site was $1,151 as of both June 30, 2020 and December 31, 2019.

Legal Proceedings

North Country Environmental Services

On or about March 8, 2018, the Citizen Groups described above delivered correspondence to our subsidiary, North Country Environmental Services, Inc. ("NCES"), and us, providing notice of the Citizen Groups' intent to sue NCES and us for violations of the CWA in conjunction with NCES's operation of its landfill in Bethlehem, New Hampshire ("NCES Landfill"). On May 14, 2018, the Citizen Groups filed a lawsuit against NCES and us in the United States District Court for the District of New Hampshire (the “New Hampshire Court”) alleging violations of the CWA, arguing that ground water discharging into the Ammonoosuc River is a "point source" under the CWA (the "New Hampshire Litigation"). The New Hampshire Litigation seeks remediation and fines under the CWA. On June 15, 2018, we and NCES filed a Motion to Dismiss the New Hampshire Litigation. On July 13, 2018, the Citizen Groups filed objections to our Motion to Dismiss. On July 27, 2018, we filed a reply in support of our Motion to Dismiss. On September 25, 2018, the New Hampshire Court denied our Motion to Dismiss. In March of 2019, we filed a motion in the New Hampshire Litigation asking for a stay of this litigation until certain appeals from discordant federal circuit courts were heard by the Supreme Court of the United States (“SCOTUS”), in the case identified as “County of Maui v. Hawaii Wildlife Fund (“MAUI”)". Our motion for a stay was granted in the New Hampshire Litigation, and SCOTUS heard the case in 2019 and issued a ruling on April 23, 2020. SCOTUS remanded the case to the U.S. Court of Appeals for the Ninth Circuit in San Francisco (the “Circuit Court”) ruling that the Circuit Court’s standard as to whether ground water impacts navigable waters is too broad. We do not believe that the MAUI decision resolves the issues presented in the New Hampshire Litigation, and until the Circuit Court rules in the remanded MAUI case, we intend to continue to vigorously defend against the New Hampshire Litigation, which we believe is without merit. The Citizens Groups filed a motion with the New Hampshire Court on July 15, 2020 to amend their complaint based on MAUI. We intend to oppose this motion to amend, and our filing is due August 7, 2020.

Ontario County, New York Class Action Litigation

On or about September 17, 2019, Richard Vandemortel and Deb Vandemortel filed a class action complaint against us on behalf of similarly situated citizens in Ontario County, New York. The lawsuit has been filed in Ontario County (the “New York Litigation”). It alleges that over one thousand (1,000) citizens constitute the putative class in the New York Litigation, and it seeks damages for diminution of property values and infringement of the putative class’ rights to live without interference to their daily lives due to odors emanating from the Subtitle D landfill located in Seneca, New York , which is operated by us pursuant to a long-term Operation, Maintenance and Lease Agreement with Ontario County. The New York Litigation was served on us on October 14, 2019. We intend to present a vigorous defense.

Hakes Landfill Litigation

On or about December 19, 2019, the New York State Department of Environmental Conservation (“Department”) issued certain permits to us to expand the landfill owned and operated by Hakes C&D Disposal Inc. in the Town of Campbell, Steuben County, New York (“Hakes Landfill”). The permits authorize approximately five years of expansion capacity at the Hakes Landfill. The authorizations issued by the Department followed approvals issued by the Town of Campbell Planning Board (“Planning Board”) in January 2019, and the Town Board of the Town of Campbell (“Town Board”) in March 2019, granting site plan review and a zoning change for the project.

Litigation was commenced by the Sierra Club, several other non-governmental organizations, and several individuals (“the Petitioners”), challenging the approvals issued by the Department, the Planning Board and the Town Board in New York State Supreme Court, Steuben County (the “Litigation”). The challenge was based upon allegations that the agencies issuing these approvals did not follow the requirements of Article 8 of the Environmental Conservation Law of the State of New York, the State Environmental Quality Review Act (“SEQRA”), by failing to address certain radioactivity issues alleged by Petitioners to be associated with certain drilling wastes authorized for disposal at the Hakes Landfill. The Petitioners also made a motion for a preliminary injunction to restrain construction and operation of the expansion cell. We filed a motion to dismiss the Litigation filed by the Petitioners, and on July 31, 2020, the motion to dismiss was granted, which also rendered the preliminary injunction motion moot, and confirmed that the Town of Campbell and the Department reviewed scientific evidence, came to a reasoned decision, and all procedural requirements were met in the issuance of the approvals.

Loss Contingency

On January 9, 2019, NCES filed an application for a 1.2 million (cy) expansion of the capacity of the NCES Landfill with the New Hampshire Department of Environmental Services (“NHDES”) (“Stage VI Expansion”). The Stage VI Expansion would provide NCES with over five (5) years of additional capacity beyond the capacity of Stage V.

In January 2020, NHDES informed NCES and us that NHDES had concerns regarding the short-term public benefit need for the Stage VI Expansion, and also in respect of certain technical concerns regarding the Stage VI Expansion. Because we believe that the NHDES reviewed our permit application for the Stage VI Expansion with respect to public benefit determination using a different regulatory framework than used in any of our previous permitting activities at NCES, we informed the NHDES on February 11, 2020, that while we vigorously disagreed with NHDES’ review of our application and the context for the NHDES’ concerns, we would withdraw our application with the expectation of refiling the application with the NHDES as soon as possible. We refiled our application on March 17, 2020. Our application has been deemed administratively complete, and a public hearing is scheduled for August 25, 2020. While the refiling of the application for the Stage VI Expansion could be rejected by the NHDES, and while delay of the Stage VI Expansion will occur, we remain confident that we will receive a permit for the Stage VI Expansion. We believe that a loss of $1,424 is reasonably possible, but not probable.

STOCKHOLDERS' EQUITY

6 Months Ended

Jun. 30, 2020

Equity [Abstract]

STOCKHOLDERS' EQUITY

Stock Based Compensation

Shares Available For Issuance

In the fiscal year ended December 31, 2016, we adopted the 2016 Incentive Plan (“2016 Plan”). Under the 2016 Plan, we may grant awards up to an aggregate amount of shares equal to the sum of: (i) 2,250 shares of Class A common stock (subject to adjustment in the event of stock splits and other similar events), plus (ii) such additional number of shares of Class A common stock (up to 2,723 shares) as is equal to the sum of the number of shares of Class A common stock that remained available for grant under the 2006 Stock Incentive Plan (“2006 Plan”) immediately prior to the expiration of the 2006 Plan and the number of shares of Class A common stock subject to awards granted under the 2006 Plan that expire, terminate or are otherwise surrendered, canceled, forfeited or repurchased by us. As of June 30, 2020, there were 1,114 Class A common stock equivalents available for future grant under the 2016 Plan.

Stock Options

Stock options are granted at a price equal to the prevailing fair value of our Class A common stock at the date of grant. Generally, stock options granted have a term not to exceed ten years and vest over a one year to four year period from the date of grant.

The fair value of each stock option granted is estimated using a Black-Scholes option-pricing model, which requires extensive use of accounting judgment and financial estimation, including estimates of the expected term stock option holders will retain their vested stock options before exercising them and the estimated volatility of our Class A common stock price over the expected term.

A summary of stock option activity follows:


	Stock Options	Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (years)	Aggregate Intrinsic Value
Outstanding, December 31, 2019	98	$	9.20
Granted	—	$	—
Exercised	(8)	$	12.48
Forfeited	—	$	—
Outstanding, June 30, 2020	90	$	8.91	5.2	$	3,894
Exercisable, June 30, 2020	90	$	8.91	5.2	$	3,894

We did not record any stock-based compensation expense for stock options during each of the three and six months ended June 30, 2020 and June 30, 2019, respectively.

During the three and six months ended June 30, 2020, the aggregate intrinsic value of stock options exercised was $296 and $296, respectively.

Other Stock Awards

Restricted stock awards, restricted stock units and performance stock units, with the exception of market-based performance stock units, are granted at a price equal to the fair value of our Class A common stock at the date of grant. The fair value of each market-based performance stock unit is estimated using a Monte Carlo pricing model, which requires extensive use of accounting judgment and financial estimation, including the estimated share price appreciation plus the value of dividends of our Class A common stock as compared to the Russell 2000 Index over the requisite service period.

Generally, restricted stock awards granted to non-employee directors vest incrementally over a three year period beginning on the first anniversary of the date of grant. Restricted stock units granted to non-employee directors vest in full on the first anniversary of the grant date. Restricted stock units granted to employees vest incrementally over an identified service period beginning on the grant date based on continued employment. Performance stock units granted to employees, including market-based performance stock units, vest at a future date following the grant date and are based on the attainment of performance targets and market achievements, as applicable.

A summary of restricted stock, restricted stock unit and performance stock unit activity follows:


	Restricted Stock, Restricted Stock Units, and Performance Stock Units (1)	Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Term (years)	Aggregate Intrinsic Value
Outstanding, December 31, 2019	393	$	28.23
Granted	149	$	47.39
Class A Common Stock Vested	(125)	$	21.95
Forfeited	(6)	$	35.18
Outstanding, June 30, 2020	411	$	37.01	2.0	$	21,414
Unvested, June 30, 2020	700	$	37.62	1.8	$	36,491

(1)Market-based performance stock unit grants are included at the 100% attainment level. Attainment of the maximum performance targets and market achievements would result in the issuance of an additional 289 shares of Class A common stock currently included in unvested.

Stock-based compensation expense related to restricted stock, restricted stock units and performance stock units was $1,763 and $3,277 during the three and six months ended June 30, 2020, respectively, as compared to $1,835 and $3,225 during the three and six months ended June 30, 2019, respectively.

During the three and six months ended June 30, 2020, the total fair value of other stock awards vested was $872 and $5,851, respectively.

As of June 30, 2020, total unrecognized stock-based compensation expense related to outstanding restricted stock was $41, which will be recognized over a weighted average period of 2.5 years. As of June 30, 2020, total unrecognized stock-based compensation expense related to outstanding restricted stock units was $4,892, which will be recognized over a weighted average period of 2.0 years. As of June 30, 2020, total unrecognized stock-based compensation expense related to outstanding performance stock units was $6,282 to be recognized over a weighted average period of 1.9 years.

We also recorded $56 and $103 of stock-based compensation expense related to our Amended and Restated 1997 Employee Stock Purchase Plan during the three and six months ended June 30, 2020, respectively, as compared to $54 and $95 during the three and six months ended June 30, 2019, respectively.

Accumulated Other Comprehensive Loss

A summary of the changes in the balances of each component of accumulated other comprehensive loss, net of tax follows:



	Interest Rate Swaps
Balance, December 31, 2019	$	(6,041)

Other comprehensive loss before reclassifications	(10,163)
Amounts reclassified from accumulated other comprehensive loss	1,293
Income tax benefit related to items of other comprehensive loss	112
Net current-period other comprehensive loss	(8,758)
Balance, June 30, 2020	$	(14,799)

A summary of reclassifications out of accumulated other comprehensive loss, net of tax follows:


	Three Months Ended June 30,						Six Months Ended June 30,
	2020		2019		2020		2019
Details About Accumulated Other Comprehensive Loss Components	Amounts Reclassified Out of Accumulated Other Comprehensive Loss									Affected Line Item in the Consolidated Statements of Operations
Interest rate swaps	$	990	$	(60)	$	1,293	$	(115)	Interest expense
	990		(60)		1,293		(115)		Income before income taxes
	—		—		(112)		—		Provision (benefit) for income taxes
	$	990	$	(60)	$	1,405	$	(115)	Net income

EARNINGS PER SHARE

6 Months Ended

Jun. 30, 2020

Earnings Per Share [Abstract]

EARNINGS PER SHARE

EARNINGS PER SHAREBasic earnings per share is computed by dividing net income by the weighted average number of common shares outstanding during the period. Diluted earnings per share is calculated based on the combined weighted average number of common shares and potentially dilutive shares, which include the assumed exercise of employee stock options, unvested restricted stock awards, unvested restricted stock units and unvested performance stock units, including market-based performance units based on the expected achievement of performance targets. In computing diluted earnings per share, we utilize the treasury stock method.

A summary of the numerator and denominators used in the computation of earnings per share follows:


	Three Months Ended June 30,						Six Months Ended June 30,
	2020		2019		2020		2019
Numerator:
Net income	$	12,113	$	11,915	$	13,072	$	10,201
Denominators:
Number of shares outstanding, end of period:
Class A common stock	47,382		46,599		47,382		46,599
Class B common stock	988		988		988		988
Shares to be issued - acquisition	—		36		—		36
Unvested restricted stock	(1)		(9)		(1)		(9)
Effect of weighted average shares outstanding	(21)		(150)		(193)		(921)
Basic weighted average common shares outstanding	48,348		47,464		48,176		46,693
Impact of potentially dilutive securities:
Dilutive effect of stock options and other stock awards	215		757		235		731
Diluted weighted average common shares outstanding	48,563		48,221		48,411		47,424
Anti-dilutive potentially issuable shares	12		—		12		154

OTHER ITEMS AND CHARGES	6 Months Ended
OTHER ITEMS AND CHARGES	Jun. 30, 2020
Unusual or Infrequent Items, or Both [Abstract]
OTHER ITEMS AND CHARGES	OTHER ITEMS AND CHARGES Expense from Acquisition Activities In the three and six months ended June 30, 2020, we recorded charges of $352 and $1,360, respectively, and in the three and six months ended June 30, 2019, we recorded charges of $464 and $1,140, respectively, comprised primarily of legal, consulting and other similar costs associated with the acquisition and integration of acquired businesses or select development projects. Southbridge Landfill Closure Charge In 2017, we initiated the plan to cease operations of the Southbridge Landfill and later closed it in November 2018 when Southbridge Landfill reached its final capacity. Accordingly, in the three and six months ended June 30, 2020 we recorded charges of $559 and $1,172, respectively, comprised of $595 and $1,208, respectively, of legal and other costs in the three and six months ended June 30, 2020 pertaining to various matters as part of the unplanned early closure of the Southbridge Landfill through completion of the closure process, a charge of $152 in the three and six months ended June 30, 2020 due to changes in estimated costs and timing of final capping, closure and post-closure activities at the Southbridge Landfill, and a charge of $(188) in the three and six months ended June 30, 2020 associated with the completion of the environmental remediation at the site. In the three and six months ended June 30, 2019, we recorded charges of $917 and $1,472, respectively, associated with legal and other costs pertaining to various matters as part of the unplanned early closure of the Southbridge Landfill through completion of the closure process.

FAIR VALUE OF FINANCIAL INSTRUMENTS

6 Months Ended

Jun. 30, 2020

Fair Value Disclosures [Abstract]

FAIR VALUE OF FINANCIAL INSTRUMENTS

We use a three-tier fair value hierarchy to classify and disclose all assets and liabilities measured at fair value on a recurring basis, as well as assets and liabilities measured at fair value on a non-recurring basis, in periods subsequent to their initial measurement. These tiers include: Level 1, defined as quoted market prices in active markets for identical assets or liabilities; Level 2, defined as inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities; and Level 3, defined as unobservable inputs that are not corroborated by market data.

We use valuation techniques that maximize the use of market prices and observable inputs and minimize the use of unobservable inputs. In measuring the fair value of our financial assets and liabilities, we rely on market data or assumptions that we believe market participants would use in pricing an asset or a liability.

Assets and Liabilities Accounted for at Fair Value

Our financial instruments include cash and cash equivalents, accounts receivable, restricted investment securities held in trust on deposit with various banks as collateral for our obligations relative to our landfill final capping, closure and post-closure costs, interest rate swaps, trade payables and long-term debt. The carrying values of cash and cash equivalents, accounts receivable and trade payables approximate their respective fair values due to their short-term nature. The fair value of restricted investment securities held in trust, which are valued using quoted market prices, are included as restricted assets in the Level 1 tier below. The fair value of the interest rate swaps included in the Level 2 tier below is calculated using discounted cash flow valuation methodologies based upon the one month LIBOR yield curves that are observable at commonly quoted intervals for the full term of the swaps.

Recurring Fair Value Measurements

Summaries of our financial assets and liabilities that are measured at fair value on a recurring basis follow:


	Fair Value Measurement at June 30, 2020 Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Restricted investment securities - landfill closure	$	1,555	$	—	$	—



Liabilities:
Interest rate swaps	$	—	$	14,598	$	—


	Fair Value Measurement at December 31, 2019 Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:


Restricted investment securities - landfill closure	$	1,586	$	—	$	—


Liabilities:
Interest rate swaps	$	—	$	5,427	$	—

Fair Value of Debt

As of June 30, 2020, the fair value of our fixed rate debt, including our FAME Bonds 2005R-3, FAME Bonds 2015R-1, FAME Bonds 2015R-2, Vermont Bonds, New York Bonds 2014, New York Bonds 2014R-2 and New Hampshire Bonds was approximately $125,942 and the carrying value was $122,000. The fair value of the FAME Bonds 2005R-3, the FAME Bonds 2015R-1, the FAME Bonds 2015R-2, the Vermont Bonds, the New York Bonds 2014, the New York Bonds 2014R-2 and the New Hampshire Bonds is considered to be Level 2 within the fair value hierarchy as the fair value is determined using market approach pricing provided by a third-party that utilizes pricing models and pricing systems, mathematical tools and judgment to determine the evaluated price for the security based on the market information of each of the bonds or securities with similar characteristics.

As of June 30, 2020, the carrying value of our Term Loan Facility was $350,000 and the carrying value of our Revolving Credit Facility was $37,700. Their fair values are based on current borrowing rates for similar types of borrowing arrangements, or Level 2 inputs, and approximate their carrying values.

Although we have determined the estimated fair value amounts of FAME Bonds 2005R-3, FAME Bonds 2015R-1, FAME Bonds 2015R-2, Vermont Bonds, New York Bonds 2014, New York Bonds 2014R-2 and New Hampshire Bonds using available market information and commonly accepted valuation methodologies, a change in available market information, and/or the use of different assumptions and/or estimation methodologies could have a material effect on the estimated fair values. These amounts have not been revalued, and current estimates of fair value could differ significantly from the amounts presented.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

SEGMENT REPORTING

6 Months Ended

Jun. 30, 2020

Segment Reporting [Abstract]

SEGMENT REPORTING

We report selected information about our reportable operating segments in a manner consistent with that used for internal management reporting. We classify our solid waste operations on a geographic basis through regional operating segments, our Western and Eastern regions. Revenues associated with our solid waste operations are derived mainly from solid waste collection and disposal, landfill, landfill gas-to-energy, transfer and recycling services in the northeastern United States. We classify our resource-renewal services by service in our Resource Solutions segment. Revenues associated with our resource renewal operations are derived from organics services, major account and industrial services, as well as recycling services generated from both municipalities and customers in the form of processing fees, tipping fees and commodity sales. Legal, tax, information technology, human resources, certain finance and accounting and other administrative functions are included in our Corporate Entities segment.

Three Months Ended June 30, 2020


Segment	Outside revenues		Inter-company revenues		Depreciation and amortization		Operating income (loss)		Total assets
Eastern	$	53,336	$	13,837	$	6,339	$	4,366	$	211,441
Western	87,286		29,020		13,615		11,863		626,329
Resource solutions	48,145		2,448		1,538		1,801		91,907
Corporate entities	—		—		584		(586)		37,294
Eliminations	—		(45,305)		—		—		—
	$	188,767	$	—	$	22,076	$	17,444	$	966,971

Three Months Ended June 30, 2019


Segment	Outside revenues		Inter-company revenues		Depreciation and amortization		Operating income (loss)		Total assets
Eastern	$	57,076	$	14,678	$	6,368	$	4,227	$	211,891
Western	85,748		24,496		11,413		10,372		531,027
Resource solutions	44,635		2,740		1,303		1,604		88,181
Corporate entities	—		—		631		(659)		34,861
Eliminations	—		(41,914)		—		—		—
	$	187,459	$	—	$	19,715	$	15,544	$	865,960

Six Months Ended June 30, 2020



Segment	Outside revenues		Inter-company revenues		Depreciation and amortization		Operating income (loss)		Total assets
Eastern	$	103,479	$	25,676	$	12,297	$	5,341	$	211,441
Western	172,491		54,566		26,847		17,505		626,329
Resource Solutions	95,706		5,341		3,148		2,804		91,907
Corporate Entities	—		—		1,190		(1,194)		37,294
Eliminations	—		(85,583)		—		—		—
Total	$	371,676	$	—	$	43,482	$	24,456	$	966,971

Six Months Ended June 30, 2019



Segment	Outside revenues		Inter-company revenues		Depreciation and amortization		Operating income (loss)		Total assets
Eastern	$	104,073	$	25,449	$	11,629	$	3,600	$	211,891
Western	159,899		44,714		21,647		15,749		531,027
Resource Solutions	87,151		5,127		2,597		2,005		88,181
Corporate Entities	—		—		1,331		(1,368)		34,861
Eliminations	—		(75,290)		—		—		—
Total	$	351,123	$	—	$	37,204	$	19,986	$	865,960

A summary of our revenues attributable to services provided follows:


	Three Months Ended June 30,						Six Months Ended June 30,
	2020		2019		2020		2019
Collection	$	94,008	$	92,066	$	188,584	$	175,145
Disposal	43,746		48,139		82,371		84,194
Power generation	918		711		1,944		1,847
Processing	1,950		1,908		3,071		2,786
Solid waste operations	140,622		142,824		275,970		263,972
Organics	15,419		14,905		30,351		28,501
Customer solutions	20,239		19,216		41,902		37,370
Recycling	12,487		10,514		23,453		21,280
Resource solutions operations	48,145		44,635		95,706		87,151
Total revenues	$	188,767	$	187,459	$	371,676	$	351,123

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

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-Name Accounting Standards Codification
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+ Details

ACCOUNTING CHANGES (Policies)

6 Months Ended

Jun. 30, 2020

Accounting Changes and Error Corrections [Abstract]

Basis of Accounting

Casella Waste Systems, Inc. (“Parent”), and its consolidated subsidiaries (collectively, “we”, “us” or “our”), is a regional, vertically integrated solid waste services company that provides collection, transfer, disposal, landfill, landfill gas-to-energy, recycling and organics services in the northeastern United States. We market recyclable metals, aluminum, plastics, paper, and corrugated cardboard, which have been processed at our recycling facilities, as well as recyclables purchased from third-parties. Effective January 1, 2020, we reorganized our operations to consist of a single resource-renewal focused operation by combining our larger-scale recycling and commodity brokerage operations along with our organics services and major account and industrial services into our Resource Solutions segment. We continue to manage our solid waste operations on a geographic basis through two regional operating segments, the Eastern and Western regions, each of which provides a full range of solid waste services. Legal, tax, information technology, human resources, certain finance and accounting and other administrative functions are included in our Corporate Entities segment. Segment information reported in the three and six months ended June 30, 2019 and as of December 31, 2019 has been reclassified to conform with the three and six months ended June 30, 2020 and as of June 30, 2020 presentation.

The accompanying unaudited consolidated financial statements, which include the accounts of the Parent and our wholly-owned subsidiaries, have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). All significant intercompany accounts and transactions are eliminated in consolidation. Investments in entities in which we do not have a controlling financial interest are accounted for under either the equity method or the cost method of accounting, as appropriate. Our significant accounting policies are more fully discussed in Item 8 of our Annual Report on Form 10-K for the fiscal year ended December 31, 2019, which was filed with the SEC on February 21, 2020.

Use of Estimates

Preparation of our consolidated financial statements in accordance with GAAP requires management to make certain estimates and assumptions. These estimates and assumptions affect the accounting for and recognition and disclosure of assets, liabilities, equity, revenues and expenses. We must make these estimates and assumptions because certain information that we use is dependent on future events, cannot be calculated with a high degree of precision given the available data, or simply cannot be readily calculated. In the opinion of management, these consolidated financial statements include all adjustments, which include normal recurring and nonrecurring adjustments, necessary for a fair presentation of the financial position, results of operations and cash flows for the periods presented. The results for the three and six months ended June 30, 2020 may not be indicative of the results for any other interim period or the entire fiscal year.

Subsequent Events

We have evaluated subsequent events or transactions that have occurred after the consolidated balance sheet date of June 30, 2020 through the date of filing of the consolidated financial statements with the SEC on this Quarterly Report on Form 10-Q. We have determined that there are no subsequent events that require disclosure in this Quarterly Report on Form 10-Q.

Accounting Standards that are Adopted and Pending Adoption

Standard

Description

Effect on the Financial Statements or Other
Significant Matters

Accounting standards adopted effective January 1, 2020

ASU No. 2016-13, as amended through March 2020: Financial Instrument Credit Losses (Topic 326)

Requires that an entity measures all of its expected credit losses for financial assets held based on historical experience, current conditions, and reasonable and supportable forecasts.

Standard

Description

Effect on the Financial Statements or Other
Significant Matters

Accounting standards issued pending adoption

ASU No. 2020-04: Reference Rate Reform (Topic 848)

ASU No. 2019-12: Income Taxes (Topic 740)

Reduces the complexity over accounting for income taxes by removing certain exceptions and amending guidance to improve consistent application of accounting over income taxes.

Leases

We lease vehicles, equipment, property and other non-core equipment in the ordinary course of our business. Leases are classified as either operating leases or finance leases, as appropriate. Our leases have varying terms and may include renewal or purchase options, escalation clauses, restrictions, lease concessions, capital project funding, penalties or other obligations that we considered historically in determining minimum rental payments. We recognize lease expense for operating leases on a straight-line basis over the lease term. We recognize depreciation expense for finance leases over either the useful life of the asset or the lease term based on the terms of the lease agreement.We are also party to three landfill operation and management agreements. These agreements are long-term landfill operating contracts with government bodies whereby we receive tipping revenue, pay normal operating expenses and assume future final capping, closure and post-closure obligations. The government body retains ownership of the landfill. There is no bargain purchase option and title to the property does not pass to us at the end of the lease term. We allocate the consideration paid to the landfill airspace rights and underlying land lease based on the relative fair values. In addition to up-front or one-time payments, the landfill operating agreements may require us to make future minimum rental payments, including success/expansion fees, other direct costs and final capping, closure and post-closure costs. The value of all future minimum rental payments is amortized and charged to cost of operations over the life of the contract. We amortize the consideration allocated to airspace rights as airspace is utilized on a units-of-consumption basis and such amortization is charged to cost of operations as airspace is consumed (e.g., as tons are placed into the landfill). The underlying value of any land lease is amortized to cost of operations on a straight-line basis over the estimated life of the operating agreement.

Accrued Final Capping, Closure and Post Closure

Accrued final capping, closure and post-closure costs include the current and non-current portion of costs associated with obligations for final capping, closure and post-closure of our landfills. We estimate our future final capping, closure and post-closure costs in order to determine the final capping, closure and post-closure expense per ton of waste placed into each landfill. The anticipated time frame for paying these costs varies based on the remaining useful life of each landfill as well as the duration of the post-closure monitoring period.

Fair Value of Financial Instruments

Assets and Liabilities Accounted for at Fair ValueOur financial instruments include cash and cash equivalents, accounts receivable, restricted investment securities held in trust on deposit with various banks as collateral for our obligations relative to our landfill final capping, closure and post-closure costs, interest rate swaps, trade payables and long-term debt. The carrying values of cash and cash equivalents, accounts receivable and trade payables approximate their respective fair values due to their short-term nature. The fair value of restricted investment securities held in trust, which are valued using quoted market prices, are included as restricted assets in the Level 1 tier below. The fair value of the interest rate swaps included in the Level 2 tier below is calculated using discounted cash flow valuation methodologies based upon the one month LIBOR yield curves that are observable at commonly quoted intervals for the full term of the swaps.

Segment Reporting

- Definition

Disclosure of accounting policy for segment reporting.

+ References + Details

ACCOUNTING CHANGES (Tables)

6 Months Ended

Jun. 30, 2020

Accounting Changes and Error Corrections [Abstract]

Schedule of New Accounting Pronouncements and Changes in Accounting Principles

Standard

Description

Effect on the Financial Statements or Other
Significant Matters

Accounting standards adopted effective January 1, 2020

ASU No. 2016-13, as amended through March 2020: Financial Instrument Credit Losses (Topic 326)

Requires that an entity measures all of its expected credit losses for financial assets held based on historical experience, current conditions, and reasonable and supportable forecasts.

Standard

Description

Effect on the Financial Statements or Other
Significant Matters

Accounting standards issued pending adoption

ASU No. 2020-04: Reference Rate Reform (Topic 848)

ASU No. 2019-12: Income Taxes (Topic 740)

Reduces the complexity over accounting for income taxes by removing certain exceptions and amending guidance to improve consistent application of accounting over income taxes.

REVENUE RECOGNITION (Tables)

6 Months Ended

Jun. 30, 2020

Revenue from Contract with Customer [Abstract]

Schedule of Disaggregation of Revenue

A table of revenues disaggregated by service line and timing of revenue recognition by operating segment for each of the three and six months ended June 30, 2020 and 2019 follows:

Three Months Ended June 30, 2020


	Eastern		Western		Resource Solutions		Total Revenues
Collection	$	37,115	$	58,546	$	—	$	95,661
Landfill	4,568		15,218		—		19,786
Transfer	11,451		9,016		—		20,467
Customer solutions	—		—		20,239		20,239


Recycling	4		332		12,487		12,823


Organics	—		—		15,419		15,419
Transportation	—		3,454		—		3,454


Landfill gas-to-energy	198		720		—		918
Total revenues	$	53,336	$	87,286	$	48,145	$	188,767

Transferred at a point-in-time	$	69	$	367	$	8,231	$	8,667
Transferred over time	53,267		86,919		39,914		180,100
Total revenues	$	53,336	$	87,286	$	48,145	$	188,767

Three Months Ended June 30, 2019


	Eastern		Western		Resource Solutions		Total Revenues
Collection	$	38,955	$	54,151	$	—	$	93,106
Landfill	5,427		18,855		—		24,282
Transfer	11,923		8,597		—		20,520
Customer solutions	—		—		19,216		19,216


Recycling	577		341		10,514		11,432


Organics	—		—		14,905		14,905
Transportation	—		3,287		—		3,287


Landfill gas-to-energy	194		517		—		711
Total revenues	$	57,076	$	85,748	$	44,635	$	187,459

Transferred at a point-in-time	$	52	$	178	$	6,505	$	6,735
Transferred over time	57,024		85,570		38,130		180,724
Total revenues	$	57,076	$	85,748	$	44,635	$	187,459

Six Months Ended June 30, 2020



	Eastern		Western		Resource Solutions		Total Revenues
Collection	$	73,944	$	117,185	$	—	$	191,129
Landfill	8,112		31,528		—		39,640
Transfer	20,834		15,722		—		36,556
Customer solutions	—		—		41,902		41,902


Recycling	6		571		23,453		24,030


Organics	—		—		30,351		30,351
Transportation	—		6,124		—		6,124


Landfill gas-to-energy	583		1,361		—		1,944
Total revenues	$	103,479	$	172,491	$	95,706	$	371,676

Transferred at a point-in-time	$	125	$	602	$	12,692	$	13,419
Transferred over time	103,354		171,889		83,014		358,257
Total revenues	$	103,479	$	172,491	$	95,706	$	371,676

Six Months Ended June 30, 2019



	Eastern		Western		Resource Solutions		Total Revenues
Collection	$	72,919	$	103,746	$	—	$	176,665
Landfill	9,144		34,323		—		43,467
Transfer	20,909		13,872		—		34,781
Customer solutions	—		—		37,370		37,370


Recycling	578		782		21,280		22,640


Organics	—		—		28,501		28,501
Transportation	—		5,852		—		5,852


Landfill gas-to-energy	523		1,324		—		1,847
Total revenues	$	104,073	$	159,899	$	87,151	$	351,123

Transferred at a point-in-time	$	88	$	487	$	12,896	$	13,471
Transferred over time	103,985		159,412		74,255		337,652
Total revenues	$	104,073	$	159,899	$	87,151	$	351,123

BUSINESS COMBINATIONS (Tables)

6 Months Ended

Jun. 30, 2020

Business Combinations [Abstract]

Summary of Purchase Price Paid for Acquisitions

A summary of the purchase price paid for these acquisitions and the allocation of the purchase price for these acquisitions follows:


	Six Months Ended June 30,
	2020		2019
Purchase Price:
Cash used in acquisitions, net of cash acquired	$	19,212	$	25,546
Notes payable	—		2,250


Contingent consideration and holdbacks	2,837		1,120
Total	22,049		28,916
Allocated as follows:
Current assets	132		1,865

Land	685		726
Buildings	2,118		2,602
Equipment	8,277		8,655
Intangible assets	5,912		11,619
Other liabilities, net	(222)		(1,546)
Deferred tax liability	—		(2,137)
Fair value of assets acquired and liabilities assumed	16,902		21,784
Excess purchase price allocated to goodwill	$	5,147	$	7,132

Schedule of Unaudited Pro forma Combined Information

Unaudited pro forma combined information that shows our operational results as though each acquisition completed since the beginning of the prior fiscal year had occurred as of January 1, 2019 is as follows:


	Three Months Ended June 30,						Six Months Ended June 30,
	2020		2019		2020		2019
Revenues	$	189,026	$	201,608	$	373,623	$	381,518
Operating income	$	17,448	$	16,850	$	24,517	$	22,751
Net income	$	12,115	$	12,629	$	13,087	$	11,709

Basic earnings per share attributable to common stockholders:
Weighted average common shares outstanding	48,348		47,464		48,176		46,693
Basic earnings per common share	$	0.25	$	0.27	$	0.27	$	0.25
Diluted earnings per share attributable to common stockholders:
Weighted average common shares outstanding	48,563		48,221		48,411		47,424
Diluted earnings per common share	$	0.25	$	0.26	$	0.27	$	0.25

ACCOUNTS RECEIVABLE, NET OF ALLOWANCE FOR CREDIT LOSSES (Tables)

6 Months Ended

Jun. 30, 2020

Credit Loss [Abstract]

Summary of Changes to Allowance for Credit Losses

A summary of the changes to allowance for credit losses follows:


	Six Months Ended June 30, 2020
Balance at beginning of period	$	1,468
Cumulative effect of new accounting principle	189
Additions - charged to expense	1,697
Deductions - bad debts written off, net of recoveries	(739)
Balance at end of period	$	2,615

LEASES (Tables)

6 Months Ended

Jun. 30, 2020

Leases [Abstract]

Schedule of Lease Costs and Other Lease Information

A schedule of lease costs and other lease information follows:


	Three Months Ended June 30,						Six Months Ended June 30,
	2020		2019		2020		2019
Lease cost:
Amortization of right-of-use assets	$	859	$	503	$	1,591	$	912
Interest expense	290		186		536		342
Fixed lease cost - vehicles, equipment and property	2,171		2,342		4,588		4,921
Fixed lease cost - landfill operating leases	1,795		1,975		3,468		3,623
Fixed lease cost	3,966		4,317		8,056		8,544
Short-term lease cost	729		1,092		1,658		1,750
Variable lease cost	129		35		261		42
Total lease cost	$	5,973	$	6,133	$	12,102	$	11,590

Other information:
Cash paid for amounts included in the measurement of lease liabilities:
Financing cash flows for finance leases	$	981	$	733	$	1,942	$	1,204
Operating cash flows for operating leases	$	3,272	$	4,831	$	5,714	$	6,874
Right-of-use assets obtained in exchange for new finance lease liabilities	$	5,391	$	4,384	$	11,793	$	6,857
Right-of-use assets obtained in exchange for new operating lease liabilities	$	776	$	173	$	3,142	$	588

							June 30, 2020
Weighted-average remaining lease term - finance leases (years)									6.1
Weighted-average remaining lease term - operating leases (years)									11.8
Weighted-average discount rate - finance leases									4.6	%
Weighted-average discount rate - operating leases									5.1	%

Schedule of Estimated Minimum Future Finance Lease Obligations

Estimated minimum future lease obligations are as follows:


	Operating Leases		Finance Leases
Fiscal year ending December 31, 2020	$	7,512	$	2,928
Fiscal year ending December 31, 2021	12,145		5,706
Fiscal year ending December 31, 2022	9,486		5,113
Fiscal year ending December 31, 2023	7,296		4,947
Fiscal year ending December 31, 2024	6,638		4,847
Thereafter	63,964		9,778
Total lease payments	107,041		33,319
Less: interest expense	(28,416)		(5,056)
Lease liability balance	$	78,625	$	28,263

Schedule of Estimated Minimum Future Operating Lease Obligations

Estimated minimum future lease obligations are as follows:


	Operating Leases		Finance Leases
Fiscal year ending December 31, 2020	$	7,512	$	2,928
Fiscal year ending December 31, 2021	12,145		5,706
Fiscal year ending December 31, 2022	9,486		5,113
Fiscal year ending December 31, 2023	7,296		4,947
Fiscal year ending December 31, 2024	6,638		4,847
Thereafter	63,964		9,778
Total lease payments	107,041		33,319
Less: interest expense	(28,416)		(5,056)
Lease liability balance	$	78,625	$	28,263

GOODWILL AND INTANGIBLE ASSETS (Tables)

6 Months Ended

Jun. 30, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Goodwill Activity

A summary of the activity and balances related to goodwill by reporting segment is as follows:


	December 31, 2019		Acquisitions		June 30, 2020
Eastern region	$	30,720	$	—	$	30,720
Western region	141,055		5,147		146,202
Resource solutions	14,044		—		14,044

Total	$	185,819	$	5,147	$	190,966

Summary of Intangible Assets by Intangible Asset Type

A summary of intangible assets by intangible asset type follows:


	Covenants Not-to-Compete		Client Lists		Total
Balance, June 30, 2020
Intangible assets	$	26,652	$	76,635	$	103,287
Less accumulated amortization	(19,756)		(23,123)		(42,879)
	$	6,896	$	53,512	$	60,408


	Covenants Not-to-Compete		Client Lists		Total
Balance, December 31, 2019
Intangible assets	$	26,162	$	71,122	$	97,284
Less accumulated amortization	(18,968)		(19,595)		(38,563)
	$	7,194	$	51,527	$	58,721

Summary of Intangible Amortization Expense Estimated

A summary of intangible amortization expense estimated for the five fiscal years following the fiscal year ended December 31, 2019 and thereafter follows:



Estimated Future Amortization Expense as of June 30, 2020
Fiscal year ending December 31, 2020	$	4,441
Fiscal year ending December 31, 2021	$	7,500
Fiscal year ending December 31, 2022	$	6,848
Fiscal year ending December 31, 2023	$	6,640
Fiscal year ending December 31, 2024	$	7,603
Thereafter	$	27,376

ACCRUED FINAL CAPPING, CLOSURE AND POST CLOSURE (Tables)

6 Months Ended

Jun. 30, 2020

Asset Retirement Obligation Disclosure [Abstract]

Summary of Changes to Accrued Capping, Closure and Post-Closure Liabilities

A summary of the changes to accrued final capping, closure and post-closure liabilities follows:


	Six Months Ended June 30,
	2020		2019
Beginning balance	$	71,927	$	73,075
Obligations incurred	1,764		1,217
Revision in estimates (1)	152		—
Accretion expense	3,204		3,194

Obligations settled (2)	(1,650)		(2,947)
Ending balance	$	75,397	$	74,539

(2)Includes amounts that are being processed through accounts payable as a part of our disbursements cycle.

DEBT (Tables)

6 Months Ended

Jun. 30, 2020

Debt And Derivatives Disclosure [Abstract]

Summary of Long-term Debt and Finance Leases by Debt Instrument

A summary of debt is as follows:


	June 30, 2020		December 31, 2019
Senior Secured Credit Facility:
Revolving line of credit facility ("Revolving Credit Facility") due May 2023; bearing interest at LIBOR plus 1.75%	$	37,700	$	26,900
Term loan A facility ("Term Loan Facility") due May 2023; bearing interest at LIBOR plus 1.75%	350,000		350,000

Tax-Exempt Bonds:
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014 ("New York Bonds 2014") due December 2044 - fixed rate interest period through 2019; bearing interest at 2.875%	25,000		25,000
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014R-2 ("New York Bonds 2014R-2") due December 2044 - fixed rate interest period through 2026; bearing interest at 3.125%	15,000		15,000
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-3 ("FAME Bonds 2005R-3") due January 2025 - fixed rate interest period through 2025; bearing interest at 5.25%	25,000		25,000
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2015R-1 ("FAME Bonds 2015R-1") due August 2035 - fixed rate interest period through 2025; bearing interest at 5.125%	15,000		15,000
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2015R-2 ("FAME Bonds 2015R-2") due August 2035 - fixed rate interest period through 2025; bearing interest at 4.375%	15,000		15,000
Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2013 ("Vermont Bonds") due April 2036 - fixed rate interest period through 2028; bearing interest at 4.625%	16,000		16,000
Business Finance Authority of the State of New Hampshire Solid Waste Disposal Revenue Bonds Series 2013 ("New Hampshire Bonds") due April 2029 - fixed rate interest period through 2029; bearing interest at 2.95%	11,000		11,000
Other:
Finance leases maturing through December 2107; bearing interest at a weighted average of 4.6%	28,263		18,364
Notes payable maturing through June 2027; bearing interest at a weighted average of 3.5%	5,104		5,464
Principal amount of debt	543,067		522,728
Less—unamortized debt issuance costs (1)	8,362		9,406
Debt less unamortized debt issuance costs	534,705		513,322
Less—current maturities of debt	6,948		4,301
	$	527,757	$	509,021

(1)A summary of unamortized debt issuance costs by debt instrument follows:


	June 30, 2020		December 31, 2019
Revolving Credit Facility and Term Loan Facility (collectively, the "Credit Facility")	$	4,659	$	5,478
New York Bonds 2014	1,034		1,057
New York Bonds 2014R-2	359		390
FAME Bonds 2005R-3	389		432
FAME Bonds 2015R-1	517		552
FAME Bonds 2015R-2	380		417
Vermont Bonds	514		541
New Hampshire Bonds	510		539
	$	8,362	$	9,406

Summary of Cash Flow Hedges

A summary of the effect of cash flow hedges related to derivative instruments on the consolidated balance sheet follows:


		Fair Value
	Balance Sheet Location	June 30, 2020		December 31, 2019




Interest rate swaps	Other accrued liabilities	$	4,636	$	1,824
Interest rate swaps	Other long-term liabilities	9,962		3,603
		$	14,598	$	5,427

Interest rate swaps	Accumulated other comprehensive loss	$	(14,799)	$	(5,929)
Interest rate swaps - tax provision	Accumulated other comprehensive loss	—		(112)
		$	(14,799)	$	(6,041)

A summary of the amount of expense on cash flow hedging relationships related to interest rate swaps reclassified from accumulated other comprehensive loss into earnings follows:


	Three Months Ended June 30,						Six Months Ended June 30,
	2020		2019		2020		2019
Statement of Operations Location	(Expense) Income						(Expense) Income
Interest expense	$	(990)	$	60	$	(1,293)	$	115

COMMITMENTS AND CONTINGENCIES (Tables)

6 Months Ended

Jun. 30, 2020

Commitments and Contingencies Disclosure [Abstract]

Summary of Environmental Liability

A summary of the changes to the environmental remediation liability associated with the Southbridge Landfill follows:



	Six Months Ended June 30,
	2020		2019
Beginning balance	$	4,596	$	5,173
Accretion expense	62		65
Obligations incurred	28		—
Revisions in estimates (1)	(188)		—
Obligations settled (2)	(293)		(392)
Ending balance	$	4,205	$	4,846

(2)Includes amounts that are being processed through accounts payable as a part of our disbursements cycle.

STOCKHOLDERS' EQUITY (Tables)

6 Months Ended

Jun. 30, 2020

Equity [Abstract]

Summary of Stock Option Activity

A summary of stock option activity follows:


	Stock Options	Weighted Average Exercise Price		Weighted Average Remaining Contractual Term (years)	Aggregate Intrinsic Value
Outstanding, December 31, 2019	98	$	9.20
Granted	—	$	—
Exercised	(8)	$	12.48
Forfeited	—	$	—
Outstanding, June 30, 2020	90	$	8.91	5.2	$	3,894
Exercisable, June 30, 2020	90	$	8.91	5.2	$	3,894

Summary of Restricted Stock, Restricted Stock Unit and Performance Stock Unit Activity

A summary of restricted stock, restricted stock unit and performance stock unit activity follows:


	Restricted Stock, Restricted Stock Units, and Performance Stock Units (1)	Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Term (years)	Aggregate Intrinsic Value
Outstanding, December 31, 2019	393	$	28.23
Granted	149	$	47.39
Class A Common Stock Vested	(125)	$	21.95
Forfeited	(6)	$	35.18
Outstanding, June 30, 2020	411	$	37.01	2.0	$	21,414
Unvested, June 30, 2020	700	$	37.62	1.8	$	36,491

Summary of Changes in Balances of Each Component of Accumulated Other Comprehensive Loss

A summary of the changes in the balances of each component of accumulated other comprehensive loss, net of tax follows:



	Interest Rate Swaps
Balance, December 31, 2019	$	(6,041)

Other comprehensive loss before reclassifications	(10,163)
Amounts reclassified from accumulated other comprehensive loss	1,293
Income tax benefit related to items of other comprehensive loss	112
Net current-period other comprehensive loss	(8,758)
Balance, June 30, 2020	$	(14,799)

Summary of Reclassifications Out of Accumulated Other Comprehensive Loss

A summary of reclassifications out of accumulated other comprehensive loss, net of tax follows:


	Three Months Ended June 30,						Six Months Ended June 30,
	2020		2019		2020		2019
Details About Accumulated Other Comprehensive Loss Components	Amounts Reclassified Out of Accumulated Other Comprehensive Loss									Affected Line Item in the Consolidated Statements of Operations
Interest rate swaps	$	990	$	(60)	$	1,293	$	(115)	Interest expense
	990		(60)		1,293		(115)		Income before income taxes
	—		—		(112)		—		Provision (benefit) for income taxes
	$	990	$	(60)	$	1,405	$	(115)	Net income

EARNINGS PER SHARE (Tables)

6 Months Ended

Jun. 30, 2020

Earnings Per Share [Abstract]

Summary of Earnings per Share Computation

A summary of the numerator and denominators used in the computation of earnings per share follows:


	Three Months Ended June 30,						Six Months Ended June 30,
	2020		2019		2020		2019
Numerator:
Net income	$	12,113	$	11,915	$	13,072	$	10,201
Denominators:
Number of shares outstanding, end of period:
Class A common stock	47,382		46,599		47,382		46,599
Class B common stock	988		988		988		988
Shares to be issued - acquisition	—		36		—		36
Unvested restricted stock	(1)		(9)		(1)		(9)
Effect of weighted average shares outstanding	(21)		(150)		(193)		(921)
Basic weighted average common shares outstanding	48,348		47,464		48,176		46,693
Impact of potentially dilutive securities:
Dilutive effect of stock options and other stock awards	215		757		235		731
Diluted weighted average common shares outstanding	48,563		48,221		48,411		47,424
Anti-dilutive potentially issuable shares	12		—		12		154

FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)

6 Months Ended

Jun. 30, 2020

Fair Value Disclosures [Abstract]

Summary of Financial Assets and Liabilities Measured at Fair Value

Summaries of our financial assets and liabilities that are measured at fair value on a recurring basis follow:


	Fair Value Measurement at June 30, 2020 Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Restricted investment securities - landfill closure	$	1,555	$	—	$	—



Liabilities:
Interest rate swaps	$	—	$	14,598	$	—


	Fair Value Measurement at December 31, 2019 Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:


Restricted investment securities - landfill closure	$	1,586	$	—	$	—


Liabilities:
Interest rate swaps	$	—	$	5,427	$	—

SEGMENT REPORTING (Tables)

6 Months Ended

Jun. 30, 2020

Segment Reporting [Abstract]

Summary of Segment Reporting Information by Segment

Three Months Ended June 30, 2020


Segment	Outside revenues		Inter-company revenues		Depreciation and amortization		Operating income (loss)		Total assets
Eastern	$	53,336	$	13,837	$	6,339	$	4,366	$	211,441
Western	87,286		29,020		13,615		11,863		626,329
Resource solutions	48,145		2,448		1,538		1,801		91,907
Corporate entities	—		—		584		(586)		37,294
Eliminations	—		(45,305)		—		—		—
	$	188,767	$	—	$	22,076	$	17,444	$	966,971

Three Months Ended June 30, 2019


Segment	Outside revenues		Inter-company revenues		Depreciation and amortization		Operating income (loss)		Total assets
Eastern	$	57,076	$	14,678	$	6,368	$	4,227	$	211,891
Western	85,748		24,496		11,413		10,372		531,027
Resource solutions	44,635		2,740		1,303		1,604		88,181
Corporate entities	—		—		631		(659)		34,861
Eliminations	—		(41,914)		—		—		—
	$	187,459	$	—	$	19,715	$	15,544	$	865,960

Six Months Ended June 30, 2020



Segment	Outside revenues		Inter-company revenues		Depreciation and amortization		Operating income (loss)		Total assets
Eastern	$	103,479	$	25,676	$	12,297	$	5,341	$	211,441
Western	172,491		54,566		26,847		17,505		626,329
Resource Solutions	95,706		5,341		3,148		2,804		91,907
Corporate Entities	—		—		1,190		(1,194)		37,294
Eliminations	—		(85,583)		—		—		—
Total	$	371,676	$	—	$	43,482	$	24,456	$	966,971

Six Months Ended June 30, 2019



Segment	Outside revenues		Inter-company revenues		Depreciation and amortization		Operating income (loss)		Total assets
Eastern	$	104,073	$	25,449	$	11,629	$	3,600	$	211,891
Western	159,899		44,714		21,647		15,749		531,027
Resource Solutions	87,151		5,127		2,597		2,005		88,181
Corporate Entities	—		—		1,331		(1,368)		34,861
Eliminations	—		(75,290)		—		—		—
Total	$	351,123	$	—	$	37,204	$	19,986	$	865,960

Summary of Revenue Attributable to Services

A summary of our revenues attributable to services provided follows:


	Three Months Ended June 30,						Six Months Ended June 30,
	2020		2019		2020		2019
Collection	$	94,008	$	92,066	$	188,584	$	175,145
Disposal	43,746		48,139		82,371		84,194
Power generation	918		711		1,944		1,847
Processing	1,950		1,908		3,071		2,786
Solid waste operations	140,622		142,824		275,970		263,972
Organics	15,419		14,905		30,351		28,501
Customer solutions	20,239		19,216		41,902		37,370
Recycling	12,487		10,514		23,453		21,280
Resource solutions operations	48,145		44,635		95,706		87,151
Total revenues	$	188,767	$	187,459	$	371,676	$	351,123

BASIS OF PRESENTATION (Details)	6 Months Ended
BASIS OF PRESENTATION (Details)	Jun. 30, 2020 regional_operating_segment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of regional operating segments	2

ACCOUNTING CHANGES (Details) - USD ($) $ in Thousands	6 Months Ended
ACCOUNTING CHANGES (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jan. 01, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounting standards update	us-gaap:AccountingStandardsUpdate201613Member
Adjustment to retained earnings	$ (344,133)		$ (357,016)
Cumulative effect of new accounting principle
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Adjustment to retained earnings		$ (189)

- Definition

Indicates amendment to accounting standards.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 65
-Paragraph 2
-Subparagraph (f)(2)
-URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 65
-Paragraph 2
-Subparagraph (g)(1)
-URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 65
-Paragraph 15
-Subparagraph (f)(2)
-URI http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 10
-Section 65
-Paragraph 4
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121646688&loc=SL121648383-210437

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 65
-Paragraph 15
-Subparagraph (f)(1)
-URI http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 65
-Paragraph 2
-Subparagraph (g)(2)(i)
-URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 65
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-Paragraph 15
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 10
-Section 65
-Paragraph 4
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121646688&loc=SL121648383-210437

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 65
-Paragraph 15
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121322162&loc=SL121327923-165333

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 65
-Paragraph 2
-Subparagraph (h)(2)
-URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 40
-Section 65
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 10
-Section 65
-Paragraph 4
-Subparagraph (e)(3)
-URI http://asc.fasb.org/extlink&oid=121646688&loc=SL121648383-210437

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22499-107794

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Reference 17: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

REVENUE RECOGNITION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Total revenues	$ 188,767	$ 187,459	$ 371,676	$ 351,123
Transferred at a point-in-time
Disaggregation of Revenue [Line Items]
Total revenues	8,667	6,735	13,419	13,471
Transferred over time
Disaggregation of Revenue [Line Items]
Total revenues	180,100	180,724	358,257	337,652
Collection
Disaggregation of Revenue [Line Items]
Total revenues	95,661	93,106	191,129	176,665
Landfill
Disaggregation of Revenue [Line Items]
Total revenues	19,786	24,282	39,640	43,467
Transfer
Disaggregation of Revenue [Line Items]
Total revenues	20,467	20,520	36,556	34,781
Customer solutions
Disaggregation of Revenue [Line Items]
Total revenues	20,239	19,216	41,902	37,370
Recycling
Disaggregation of Revenue [Line Items]
Total revenues	12,823	11,432	24,030	22,640
Organics
Disaggregation of Revenue [Line Items]
Total revenues	15,419	14,905	30,351	28,501
Transportation
Disaggregation of Revenue [Line Items]
Total revenues	3,454	3,287	6,124	5,852
Landfill gas-to-energy
Disaggregation of Revenue [Line Items]
Total revenues	918	711	1,944	1,847
Eastern
Disaggregation of Revenue [Line Items]
Total revenues	53,336	57,076	103,479	104,073
Eastern \| Transferred at a point-in-time
Disaggregation of Revenue [Line Items]
Total revenues	69	52	125	88
Eastern \| Transferred over time
Disaggregation of Revenue [Line Items]
Total revenues	53,267	57,024	103,354	103,985
Eastern \| Collection
Disaggregation of Revenue [Line Items]
Total revenues	37,115	38,955	73,944	72,919
Eastern \| Landfill
Disaggregation of Revenue [Line Items]
Total revenues	4,568	5,427	8,112	9,144
Eastern \| Transfer
Disaggregation of Revenue [Line Items]
Total revenues	11,451	11,923	20,834	20,909
Eastern \| Customer solutions
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Eastern \| Recycling
Disaggregation of Revenue [Line Items]
Total revenues	4	577	6	578
Eastern \| Organics
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Eastern \| Transportation
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Eastern \| Landfill gas-to-energy
Disaggregation of Revenue [Line Items]
Total revenues	198	194	583	523
Western
Disaggregation of Revenue [Line Items]
Total revenues	87,286	85,748	172,491	159,899
Western \| Transferred at a point-in-time
Disaggregation of Revenue [Line Items]
Total revenues	367	178	602	487
Western \| Transferred over time
Disaggregation of Revenue [Line Items]
Total revenues	86,919	85,570	171,889	159,412
Western \| Collection
Disaggregation of Revenue [Line Items]
Total revenues	58,546	54,151	117,185	103,746
Western \| Landfill
Disaggregation of Revenue [Line Items]
Total revenues	15,218	18,855	31,528	34,323
Western \| Transfer
Disaggregation of Revenue [Line Items]
Total revenues	9,016	8,597	15,722	13,872
Western \| Customer solutions
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Western \| Recycling
Disaggregation of Revenue [Line Items]
Total revenues	332	341	571	782
Western \| Organics
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Western \| Transportation
Disaggregation of Revenue [Line Items]
Total revenues	3,454	3,287	6,124	5,852
Western \| Landfill gas-to-energy
Disaggregation of Revenue [Line Items]
Total revenues	720	517	1,361	1,324
Resource Solutions
Disaggregation of Revenue [Line Items]
Total revenues	48,145	44,635	95,706	87,151
Resource Solutions \| Transferred at a point-in-time
Disaggregation of Revenue [Line Items]
Total revenues	8,231	6,505	12,692	12,896
Resource Solutions \| Transferred over time
Disaggregation of Revenue [Line Items]
Total revenues	39,914	38,130	83,014	74,255
Resource Solutions \| Collection
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Resource Solutions \| Landfill
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Resource Solutions \| Transfer
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Resource Solutions \| Customer solutions
Disaggregation of Revenue [Line Items]
Total revenues	20,239	19,216	41,902	37,370
Resource Solutions \| Recycling
Disaggregation of Revenue [Line Items]
Total revenues	12,487	10,514	23,453	21,280
Resource Solutions \| Organics
Disaggregation of Revenue [Line Items]
Total revenues	15,419	14,905	30,351	28,501
Resource Solutions \| Transportation
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Resource Solutions \| Landfill gas-to-energy
Disaggregation of Revenue [Line Items]
Total revenues	$ 0	$ 0	$ 0	$ 0

REVENUE RECOGNITION - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
REVENUE RECOGNITION - Narrative (Details) - USD ($)	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Rebates	$ (188,767,000)	$ (187,459,000)	$ (371,676,000)	$ (351,123,000)
Revenue recognized fro performance obligation satisfied in previous period	0	0	0	0
Gross receivables from contracts	74,091,000		74,091,000		$ 80,191,000
Contract liabilities	3,056,000		3,056,000		$ 2,299,000
Adjustments \| Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Rebates	$ 1,546,000	$ 1,109,000	$ 2,537,000	$ 2,447,000

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
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-Paragraph 22
-Subparagraph (a)
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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-Subparagraph (SX 210.5-03(1))
-URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227

+ Details

BUSINESS COMBINATIONS - Narrative (Details) - business	6 Months Ended
BUSINESS COMBINATIONS - Narrative (Details) - business	Jun. 30, 2020	Jun. 30, 2019
Business Acquisition [Line Items]
Number of businesses acquired	4
Minimum
Business Acquisition [Line Items]
Useful life of finite lived intangible assets	5 years
Maximum
Business Acquisition [Line Items]
Useful life of finite lived intangible assets	10 years
Western \| Tuck-in Solid Waste Collection Business
Business Acquisition [Line Items]
Number of businesses acquired	3
Resource Solutions \| Recycling Operation
Business Acquisition [Line Items]
Number of businesses acquired	1
Eastern \| Tuck-in Solid Waste Collection Business
Business Acquisition [Line Items]
Number of businesses acquired		3

BUSINESS COMBINATIONS - Summary of Purchase Price Paid for Acquisitions (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Purchase Price:
Cash used in acquisitions, net of cash acquired	$ 20,091	$ 27,687
Allocated as follows:
Excess purchase price allocated to goodwill	190,966		$ 185,819
Waste Collection Acquisitions
Purchase Price:
Cash used in acquisitions, net of cash acquired	19,212	25,546
Notes payable	0	2,250
Contingent consideration and holdbacks	2,837	1,120
Total	22,049	28,916
Allocated as follows:
Current assets	132	1,865
Land	685	726
Buildings	2,118	2,602
Equipment	8,277	8,655
Intangible assets	5,912	11,619
Other liabilities, net	(222)	(1,546)
Deferred tax liability	0	(2,137)
Fair value of assets acquired and liabilities assumed	16,902	21,784
Excess purchase price allocated to goodwill	$ 5,147	$ 7,132

BUSINESS COMBINATIONS - Schedule of Unaudited Pro forma Combined Information (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Business Combinations [Abstract]
Revenues	$ 189,026	$ 201,608	$ 373,623	$ 381,518
Operating income	17,448	16,850	24,517	22,751
Net income	$ 12,115	$ 12,629	$ 13,087	$ 11,709
Weighted average common shares outstanding, basic	48,348	47,464	48,176	46,693
Basic earnings per common share (in dollars per share)	$ 0.25	$ 0.27	$ 0.27	$ 0.25
Weighted average common shares outstanding, diluted	48,563	48,221	48,411	47,424
Diluted earnings per common share (in dollars per share)	$ 0.25	$ 0.26	$ 0.27	$ 0.25

ACCOUNTS RECEIVABLE, NET OF ALLOWANCE FOR CREDIT LOSSES (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($)
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 1,468
Additions - charged to expense	1,697
Deductions - bad debts written off, net of recoveries	(739)
Balance at end of period	2,615
Cumulative effect of new accounting principle
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of period	$ 189

LEASES - Narrative (Details)	6 Months Ended
LEASES - Narrative (Details)	Jun. 30, 2020 Agreement
Leases [Abstract]
Number of landfill operation and management agreements	3

LEASES - Schedule of Lease Costs and Other Lease Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Lease cost:
Amortization of right-of-use assets	$ 859	$ 503	$ 1,591	$ 912
Interest expense	290	186	536	342
Fixed lease cost	3,966	4,317	8,056	8,544
Short-term lease cost	729	1,092	1,658	1,750
Variable lease cost	129	35	261	42
Total lease cost	5,973	6,133	12,102	11,590
Cash paid for amounts included in the measurement of lease liabilities:
Financing cash flows for finance leases	981	733	1,942	1,204
Operating cash flows for operating leases	3,272	4,831	5,714	6,874
Right-of-use assets obtained in exchange for new finance lease liabilities	5,391	4,384	11,793	6,857
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 776	173	$ 3,142	588
Weighted-average remaining lease term - finance leases (years)	6 years 1 month 6 days		6 years 1 month 6 days
Weighted-average remaining lease term - operating leases (years)	11 years 9 months 18 days		11 years 9 months 18 days
Weighted-average discount rate - finance leases	4.60%		4.60%		4.60%
Weighted-average discount rate - operating leases	5.10%		5.10%
Vehicles, equipment and property
Lease cost:
Fixed lease cost	$ 2,171	2,342	$ 4,588	4,921
Landfill
Lease cost:
Fixed lease cost	$ 1,795	$ 1,975	$ 3,468	$ 3,623

LEASES - Schedule of Estimated Minimum Future Lease Obligations (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Operating Leases
Fiscal year ending December 31, 2020	$ 7,512
Fiscal year ending December 31, 2021	12,145
Fiscal year ending December 31, 2022	9,486
Fiscal year ending December 31, 2023	7,296
Fiscal year ending December 31, 2024	6,638
Thereafter	63,964
Total lease payments	107,041
Less: interest expense	(28,416)
Lease liability balance	78,625
Finance Leases
Fiscal year ending December 31, 2020	2,928
Fiscal year ending December 31, 2021	5,706
Fiscal year ending December 31, 2022	5,113
Fiscal year ending December 31, 2023	4,947
Fiscal year ending December 31, 2024	4,847
Thereafter	9,778
Total lease payments	33,319
Less: interest expense	(5,056)
Lease liability balance	$ 28,263	$ 18,364

GOODWILL AND INTANGIBLE ASSETS - Summary of Goodwill Activity (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 185,819
Acquisitions	5,147
Goodwill, ending balance	190,966
Eastern
Goodwill [Roll Forward]
Goodwill, beginning balance	30,720
Acquisitions	0
Goodwill, ending balance	30,720
Western
Goodwill [Roll Forward]
Goodwill, beginning balance	141,055
Acquisitions	5,147
Goodwill, ending balance	146,202
Resource Solutions
Goodwill [Roll Forward]
Goodwill, beginning balance	14,044
Acquisitions	0
Goodwill, ending balance	$ 14,044

GOODWILL AND INTANGIBLE ASSETS - Summary of Intangible Assets by Intangible Asset Type (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 103,287	$ 97,284
Less accumulated amortization	(42,879)	(38,563)
Intangible assets, net	60,408	58,721
Covenants Not-to-Compete
Finite-Lived Intangible Assets [Line Items]
Intangible assets	26,652	26,162
Less accumulated amortization	(19,756)	(18,968)
Intangible assets, net	6,896	7,194
Client Lists
Finite-Lived Intangible Assets [Line Items]
Intangible assets	76,635	71,122
Less accumulated amortization	(23,123)	(19,595)
Intangible assets, net	$ 53,512	$ 51,527

GOODWILL AND INTANGIBLE ASSETS - Narrative (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible amortization expense	$ 2,222	$ 1,639	$ 4,316	$ 3,039

GOODWILL AND INTANGIBLE ASSETS - Summary of Intangible Amortization Expense Estimated (Detail) $ in Thousands	Jun. 30, 2020 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Fiscal year ending December 31, 2020	$ 4,441
Fiscal year ending December 31, 2021	7,500
Fiscal year ending December 31, 2022	6,848
Fiscal year ending December 31, 2023	6,640
Fiscal year ending December 31, 2024	7,603
Thereafter	$ 27,376

ACCRUED FINAL CAPPING, CLOSURE AND POST CLOSURE - Summary of Changes to Accrued Capping, Closure and Post-Closure Liabilities (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance	$ 71,927	$ 73,075
Obligations incurred	1,764	1,217
Revision in estimates	152	0
Accretion expense	3,204	3,194
Obligations settled	(1,650)	(2,947)
Ending balance	$ 75,397	$ 74,539

DEBT - Summary of Components of Long-Term Debt and Capital Leases by Debt Instrument (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Principal amount of debt	$ 543,067	$ 522,728
Finance leases maturing through December 2107; bearing interest at a weighted average of 4.6%	28,263	18,364
Less - unamortized debt issuance costs	8,362	9,406
Debt less unamortized debt issuance costs	534,705	513,322
Less—current maturities of debt	6,948	4,301
Debt, less current portion	$ 527,757	$ 509,021
Weighted-average discount rate - finance leases	4.60%	4.60%
Revolving line of credit facility ("Revolving Credit Facility") due May 2023; bearing interest at LIBOR plus 1.75%
Debt Instrument [Line Items]
Principal amount of debt	$ 37,700	$ 26,900
Revolving line of credit facility ("Revolving Credit Facility") due May 2023; bearing interest at LIBOR plus 1.75% \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.75%	1.75%
Secured Debt \| Term loan A facility ("Term Loan Facility") due May 2023; bearing interest at LIBOR plus 1.75%
Debt Instrument [Line Items]
Principal amount of debt	$ 350,000	$ 350,000
Secured Debt \| Term loan A facility ("Term Loan Facility") due May 2023; bearing interest at LIBOR plus 1.75% \| LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate	1.75%	1.75%
Credit Facility
Debt Instrument [Line Items]
Less - unamortized debt issuance costs	$ 4,659	$ 5,478
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014 ("New York Bonds 2014") due December 2044 - fixed rate interest period through 2019; bearing interest at 2.875%
Debt Instrument [Line Items]
Principal amount of debt	25,000	25,000
Less - unamortized debt issuance costs	$ 1,034	$ 1,057
Stated interest rate	2.875%	2.875%
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014R-2 ("New York Bonds 2014R-2") due December 2044 - fixed rate interest period through 2026; bearing interest at 3.125%
Debt Instrument [Line Items]
Principal amount of debt	$ 15,000	$ 15,000
Less - unamortized debt issuance costs	$ 359	$ 390
Stated interest rate	3.125%	3.125%
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-3 ("FAME Bonds 2005R-3") due January 2025 - fixed rate interest period through 2025; bearing interest at 5.25%
Debt Instrument [Line Items]
Principal amount of debt	$ 25,000	$ 25,000
Less - unamortized debt issuance costs	$ 389	$ 432
Stated interest rate	5.25%	5.25%
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2015R-1 ("FAME Bonds 2015R-1") due August 2035 - fixed rate interest period through 2025; bearing interest at 5.125%
Debt Instrument [Line Items]
Principal amount of debt	$ 15,000	$ 15,000
Less - unamortized debt issuance costs	$ 517	$ 552
Stated interest rate	5.125%	5.125%
Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2015R-2 ("FAME Bonds 2015R-2") due August 2035 - fixed rate interest period through 2025; bearing interest at 4.375%
Debt Instrument [Line Items]
Principal amount of debt	$ 15,000	$ 15,000
Less - unamortized debt issuance costs	$ 380	$ 417
Stated interest rate	4.375%	4.375%
Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2013 ("Vermont Bonds") due April 2036 - fixed rate interest period through 2028; bearing interest at 4.625%
Debt Instrument [Line Items]
Principal amount of debt	$ 16,000	$ 16,000
Less - unamortized debt issuance costs	$ 514	$ 541
Stated interest rate	4.625%	4.625%
Business Finance Authority of the State of New Hampshire Solid Waste Disposal Revenue Bonds Series 2013 ("New Hampshire Bonds") due April 2029 - fixed rate interest period through 2029; bearing interest at 2.95%
Debt Instrument [Line Items]
Principal amount of debt	$ 11,000	$ 11,000
Less - unamortized debt issuance costs	$ 510	$ 539
Stated interest rate	2.95%	2.95%
Notes payable maturing through June 2027; bearing interest at a weighted average of 3.5%
Debt Instrument [Line Items]
Principal amount of debt	$ 5,104	$ 5,464
Weighted average interest rate	3.50%	3.50%

DEBT - Credit Facility (Details)	3 Months Ended
DEBT - Credit Facility (Details)	Jun. 30, 2020 USD ($)
Line of Credit
Debt Instrument [Line Items]
Debt instrument, term	5 years
Net leverage ratio	2.25
Line of credit facility, remaining borrowing capacity	$ 135,875,000
Line of Credit \| LIBOR
Debt Instrument [Line Items]
Floor interest rate received	1.25%
Line of Credit \| Maximum \| LIBOR
Debt Instrument [Line Items]
Floor interest rate received	1.75%
Secured Debt \| Term Loan Facility \| Line of Credit
Debt Instrument [Line Items]
Aggregate principal amount	$ 350,000,000
Revolving Credit Facility \| Revolving Credit Facility Due 2023 \| Line of Credit
Debt Instrument [Line Items]
Credit facility maximum	200,000,000
Letters of credit outstanding	26,425,000
Credit Facility
Debt Instrument [Line Items]
Additional revolver capacity	$ 125,000,000

DEBT - Cash Flow Hedges (Details) - Cash Flow Hedging	6 Months Ended
DEBT - Cash Flow Hedges (Details) - Cash Flow Hedging	Jun. 30, 2020 USD ($) numberOfPlantiffs	Sep. 30, 2022 USD ($) numberOfPlantiffs	Dec. 31, 2019 USD ($)
Interest Rate Derivative
Debt Instrument [Line Items]
Number of interest rate derivative agreements \| numberOfPlantiffs	3
Notional amount	$ 190,000,000		$ 190,000,000
Floor interest rate	0.00%		1.00%
Loss from derivative instrument	$ 765,000
Proceeds from Hedge, Investing Activities	$ 430,000
Weighted average percentage rate paid	2.54%		2.54%
Interest Rate Derivative \| Forecast
Debt Instrument [Line Items]
Number of interest rate derivative agreements \| numberOfPlantiffs		3
Notional amount		$ 60,000,000
Forward Starting Interest Rate Derivative
Debt Instrument [Line Items]
Notional amount	$ 125,000,000
Floor interest rate	0.00%
Weighted average percentage rate paid	1.63%

DEBT - Schedule Of Cash Flow Hedges Related to Derivative Instruments On the Balance Sheet (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Accumulated other comprehensive loss, interest rate swaps	$ (1,619)	$ (2,861)	$ (8,812)	$ (4,335)
Designated as Hedging Instrument \| Interest rate swaps
Derivatives, Fair Value [Line Items]
Cash flow hedge derivatives, liabilities	14,598		14,598		$ 5,427
Other accrued liabilities \| Designated as Hedging Instrument \| Interest rate swaps
Derivatives, Fair Value [Line Items]
Cash flow hedge derivatives, liabilities	4,636		4,636		1,824
Other long-term liabilities \| Designated as Hedging Instrument \| Interest rate swaps
Derivatives, Fair Value [Line Items]
Cash flow hedge derivatives, liabilities	$ 9,962		9,962		3,603
Accumulated other comprehensive loss \| Designated as Hedging Instrument \| Interest rate swaps
Derivatives, Fair Value [Line Items]
Accumulated other comprehensive loss, interest rate swaps			(14,799)		(5,929)
Accumulated other comprehensive loss, interest rate swaps, tax provision			0		(112)
Accumulated other comprehensive loss			$ (14,799)		$ (6,041)

DEBT - Schedule of Loss On Cash Flow Hedges (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Other comprehensive loss, reclassification adjustment from AOCI	$ (990)	$ 60	$ (1,293)	$ 115
Designated as Hedging Instrument \| Interest rate swaps \| Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Other comprehensive loss, reclassification adjustment from AOCI	$ (990)	$ 60	$ (1,293)	$ 115

COMMITMENTS AND CONTINGENCIES - Narrative (Detail) numberOfPlantiffs in Thousands	Sep. 17, 2019 numberOfPlantiffs	Apr. 28, 2017 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)	Apr. 26, 2017 USD ($)	Jan. 29, 2016	Apr. 30, 2011 USD ($)	May 31, 2009 USD ($)	Dec. 20, 2000 a
Southbridge Landfill
Loss Contingencies [Line Items]
Risk free interest percentage rate			2.60%
Environmental remediation liability			$ 4,205,000	$ 4,596,000	$ 4,846,000	$ 5,173,000
Potsdam Environmental Remediation
Loss Contingencies [Line Items]
Risk free interest percentage rate			1.50%
Scrap yard and solid waste transfer station (in acres) \| a											25
Undiscounted costs preferred remedies									$ 12,130,000	$ 10,219,000
Remediation activities, participant share percentage								15.00%
Environmental remediation liability			$ 1,151,000	$ 1,151,000
21E Settlement and Water System Construction Funding Agreement \| Bonds
Loss Contingencies [Line Items]
Bond period		20 years
21E Settlement and Water System Construction Funding Agreement \| Bonds \| Maximum
Loss Contingencies [Line Items]
Anticipated cost		$ 4,089,000
Notice of Intent to Sue under the Resource Conservation and Recovery Act
Loss Contingencies [Line Items]
Estimate of possible loss							$ 5,000,000
Notice of Intent to Sue under the Resource Conservation and Recovery Act \| MADEP and Casella Waste Systems
Loss Contingencies [Line Items]
Estimate of possible loss							$ 10,000,000
Ontario County, New York Class Action Litigation
Loss Contingencies [Line Items]
Number of citizens seeking damages \| numberOfPlantiffs	1
Notice of Intent to Sue for Violations of the CWA \| NCES Landfil
Loss Contingencies [Line Items]
Estimate of possible loss			$ 1,424,000

COMMITMENTS AND CONTINGENCIES - Environmental Remediation Liability (Details) - Southbridge Landfill - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning balance	$ 4,596	$ 5,173
Accretion expense	62	65
Obligations incurred	28	0
Revisions in estimates	(188)	0
Obligations settled	(293)	(392)
Ending balance	$ 4,205	$ 4,846

STOCKHOLDERS' EQUITY - Narrative (Detail) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
STOCKHOLDERS' EQUITY - Narrative (Detail) - USD ($)	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2016
Limited Partners' Capital Account [Line Items]
Fair value of stock awards vested	$ 872,000		$ 5,851,000
Stock Options
Limited Partners' Capital Account [Line Items]
Stock-based compensation expense	0	$ 0	0	$ 0
Aggregate intrinsic value of options exercised	296,000		296,000
Restricted Stock, Restricted Stock Units And Performance Stock Units
Limited Partners' Capital Account [Line Items]
Stock-based compensation expense	1,763,000	1,835,000	3,277,000	3,225,000
Restricted Stock
Limited Partners' Capital Account [Line Items]
Unrecognized stock-based compensation expense	41,000		$ 41,000
Restricted Stock \| Non Employee Director
Limited Partners' Capital Account [Line Items]
Options, vesting period			3 years
Restricted Stock Unit
Limited Partners' Capital Account [Line Items]
Unrecognized stock-based compensation expense	4,892,000		$ 4,892,000
Maximum \| Performance Stock Unit
Limited Partners' Capital Account [Line Items]
Unrecognized stock-based compensation expense	6,282,000		$ 6,282,000
Weighted average \| Restricted Stock
Limited Partners' Capital Account [Line Items]
Unrecognized stock-based compensation, weighted average period			2 years 6 months
Weighted average \| Restricted Stock Unit
Limited Partners' Capital Account [Line Items]
Unrecognized stock-based compensation, weighted average period			2 years
Weighted average \| Performance Stock Unit
Limited Partners' Capital Account [Line Items]
Unrecognized stock-based compensation, weighted average period			1 year 10 months 24 days
2016 Plan
Limited Partners' Capital Account [Line Items]
Options granted, term			10 years
2016 Plan \| Minimum
Limited Partners' Capital Account [Line Items]
Options, vesting period			1 year
2016 Plan \| Maximum
Limited Partners' Capital Account [Line Items]
Options, vesting period			4 years
Amended and Restated 1997 Employee Stock Purchase Plan
Limited Partners' Capital Account [Line Items]
Stock-based compensation expense	$ 56,000	$ 54,000	$ 103,000	$ 95,000
Class A Common Stock \| 2016 Plan
Limited Partners' Capital Account [Line Items]
Common stock, authorized shares					2,250,000
Number of shares available for future grant	1,114,000		1,114,000
Class A Common Stock \| 2006 Incentive Plan
Limited Partners' Capital Account [Line Items]
Common stock, additional authorized shares					2,723,000

STOCKHOLDERS' EQUITY - Summary of Stock Option Activity (Detail) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($) $ / shares shares
Stock Options
Beginning balance, outstanding (in shares) \| shares	98
Granted (in shares) \| shares	0
Exercised (in shares) \| shares	(8)
Forfeited (in shares) \| shares	0
Ending balance, outstanding (in shares) \| shares	90
Exercisable at end of period (in shares) \| shares	90
Weighted Average Exercise Price
Beginning balance, outstanding (in dollars per share) \| $ / shares	$ 9.20
Granted (in dollars per share) \| $ / shares	0
Exercised (in dollars per share) \| $ / shares	12.48
Forfeited (in dollars per share) \| $ / shares	0
Ending balance, outstanding (in dollars per share) \| $ / shares	8.91
Exercisable at end of period (in dollars per share) \| $ / shares	$ 8.91
Weighted Average Remaining Contractual Term (years) and Aggregate Intrinsic Value
Outstanding contractual term at end of period	5 years 2 months 12 days
Exercisable contractual term at end of period	5 years 2 months 12 days
Outstanding aggregate intrinsic value at end of period \| $	$ 3,894
Exercisable aggregate intrinsic value at end of period \| $	$ 3,894

STOCKHOLDERS' EQUITY - Summary of Restricted Stock, Restricted Stock Unit and Performance-based Stock Unit Activity (Detail) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($) $ / shares shares
Restricted Stock, Restricted Stock Units And Performance Stock Units
Restricted Stock, Restricted Stock Units, and Performance Stock Units
Outstanding, beginning of period (in shares)	393
Granted (in shares)	149
Forfeited (in shares)	(6)
Outstanding, end of period (in shares)	411
Weighted Average Grant Date Fair Value
Outstanding at beginning of period (in dollars per share) \| $ / shares	$ 28.23
Granted (in dollars per share) \| $ / shares	47.39
Forfeited (in dollars per share) \| $ / shares	35.18
Outstanding at end of period (in dollars per share) \| $ / shares	$ 37.01
Weighted Average Remaining Contractual Term (years) and Aggregate Intrinsic Value
Contractual term at end of period	2 years
Aggregate intrinsic value at end of period \| $	$ 21,414
Restricted Stock, Restricted Stock Units And Performance Stock Units \| Class A Common Stock
Restricted Stock, Restricted Stock Units, and Performance Stock Units
Class A Common Stock Vested (in shares)	(125)
Weighted Average Grant Date Fair Value
Class A Common Stock Vested (in dollars per share) \| $ / shares	$ 21.95
Performance Stock Unit
Weighted Average Remaining Contractual Term (years) and Aggregate Intrinsic Value
Percentage of attainment level	100.00%
Performance Stock Unit \| Class A Common Stock
Weighted Average Remaining Contractual Term (years) and Aggregate Intrinsic Value
Number of additional shares	289
Unvested \| Restricted Stock, Restricted Stock Units And Performance Stock Units
Restricted Stock, Restricted Stock Units, and Performance Stock Units
Outstanding, end of period (in shares)	700
Weighted Average Grant Date Fair Value
Outstanding at end of period (in dollars per share) \| $ / shares	$ 37.62
Weighted Average Remaining Contractual Term (years) and Aggregate Intrinsic Value
Contractual term at end of period	1 year 9 months 18 days
Aggregate intrinsic value at end of period \| $	$ 36,491

STOCKHOLDERS' EQUITY - Summary of Changes in Balances of Each Component of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 117,996	$ 122,753	$ 83,034	$ (15,832)	$ 122,753	$ (15,832)
Income tax benefit related to items of other comprehensive loss	0		0		112	0
Other comprehensive loss, net of tax	(1,569)	(7,189)	(2,959)	(1,557)	(8,758)	(4,516)
Ending balance	130,745	117,996	$ 96,197	$ 83,034	130,745	$ 96,197
Interest Rate Swaps
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		$ (6,041)			(6,041)
Other comprehensive loss					(10,163)
accumulated other comprehensive loss					1,293
Income tax benefit related to items of other comprehensive loss					112
Other comprehensive loss, net of tax					(8,758)
Ending balance	$ (14,799)				$ (14,799)

- Definition

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

+ References + Details

STOCKHOLDERS' EQUITY - Summary of Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ 5,511		$ 6,155		$ 11,463	$ 12,615
Income before income taxes	12,470		9,990		13,538	8,304
Provision (benefit) for income taxes	0		0		(112)	0
Net income	12,113	$ 959	11,915	$ (1,714)	13,072	10,201
Interest Rate Swaps
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Provision (benefit) for income taxes					(112)
Interest rate swaps \| Interest Rate Swaps \| Amount Reclassified Out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	990		(60)		1,293	(115)
Income before income taxes	990		(60)		1,293	(115)
Net income	$ 990		$ (60)		$ 1,405	$ (115)

- Definition

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

+ References

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+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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+ Details

EARNINGS PER SHARE (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
EARNINGS PER SHARE (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Numerator:
Net income	$ 12,113	$ 11,915	$ 13,072	$ 10,201
Denominators:
Shares to be issued - acquisition	0	36,000	0	36,000
Unvested restricted stock (in shares)	(1,000)	(9,000)	(1,000)	(9,000)
Effect of weighted average shares outstanding (in shares)	(21,000)	(150,000)	(193,000)	(921,000)
Weighted average common shares outstanding, basic	48,348,000	47,464,000	48,176,000	46,693,000
Impact of potentially dilutive securities:
Dilutive effect of stock options and other stock awards (in shares)	215,000	757,000	235,000	731,000
Weighted average common shares outstanding, diluted	48,563,000	48,221,000	48,411,000	47,424,000
Anti-dilutive potentially issuable shares	12,000	0	12,000	154,000
Class A Common Stock
Denominators:
Common stock, shares outstanding	47,382,000	46,599,000	47,382,000	46,599,000	46,803,000
Class B Common Stock
Denominators:
Common stock, shares outstanding	988,000	988,000	988,000	988,000	988,000

OTHER ITEMS AND CHARGES (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
OTHER ITEMS AND CHARGES (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Site Contingency [Line Items]
Expense from acquisition activities	$ 352	$ 464	$ 1,360	$ 1,140
Southbridge Landfill closure charge	559	917	1,172	1,472
Southbridge Landfill
Site Contingency [Line Items]
Southbridge Landfill closure charge	559	$ 917	1,172	$ 1,472
Legal and other costs	595		1,208
Environmental remediation charge	152		152
Recovery credited to environmental remediation expense	$ (188)		$ (188)

FAIR VALUE OF FINANCIAL INSTRUMENTS - Recurring Fair Value Measurements (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Assets:
Restricted investment securities - landfill closure	$ 1,555	$ 1,586
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Liabilities:
Interest rate swaps	0	0
Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Landfill
Assets:
Restricted investment securities - landfill closure	1,555	1,586
Recurring \| Significant Other Observable Inputs (Level 2)
Liabilities:
Interest rate swaps	14,598	5,427
Recurring \| Significant Other Observable Inputs (Level 2) \| Landfill
Assets:
Restricted investment securities - landfill closure	0	0
Recurring \| Significant Unobservable Inputs (Level 3)
Liabilities:
Interest rate swaps	0	0
Recurring \| Significant Unobservable Inputs (Level 3) \| Landfill
Assets:
Restricted investment securities - landfill closure	$ 0	$ 0

FAIR VALUE OF FINANCIAL INSTRUMENTS - Additional Information (Detail) $ in Thousands	Jun. 30, 2020 USD ($)
Fair Value \| Fixed Rate Bonds
Debt Instrument [Line Items]
Fixed rate debt	$ 125,942
Carrying Value
Debt Instrument [Line Items]
Revolving credit facility	37,700
Carrying Value \| Fixed Rate Bonds
Debt Instrument [Line Items]
Fixed rate debt	122,000
Carrying Value \| Term Loan Facility \| Secured Debt
Debt Instrument [Line Items]
Fixed rate debt	$ 350,000

SEGMENT REPORTING - Summary of Financial Information by Reportable Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Segment Reporting Information [Line Items]
Revenues	$ 188,767	$ 187,459	$ 371,676	$ 351,123
Depreciation and amortization	22,076	19,715	43,482	37,204
Operating Income (Loss)	17,444	15,544	24,456	19,986
Total assets	966,971		966,971		$ 932,182
Operating
Segment Reporting Information [Line Items]
Revenues	188,767	187,459	371,676	351,123
Depreciation and amortization	22,076	19,715	43,482	37,204
Operating Income (Loss)	17,444	15,544	24,456	19,986
Total assets	966,971	865,960	966,971	865,960
Operating \| Eastern
Segment Reporting Information [Line Items]
Revenues	53,336	57,076	103,479	104,073
Depreciation and amortization	6,339	6,368	12,297	11,629
Operating Income (Loss)	4,366	4,227	5,341	3,600
Total assets	211,441	211,891	211,441	211,891
Operating \| Western
Segment Reporting Information [Line Items]
Revenues	87,286	85,748	172,491	159,899
Depreciation and amortization	13,615	11,413	26,847	21,647
Operating Income (Loss)	11,863	10,372	17,505	15,749
Total assets	626,329	531,027	626,329	531,027
Operating \| Resource Solutions
Segment Reporting Information [Line Items]
Revenues	48,145	44,635	95,706	87,151
Depreciation and amortization	1,538	1,303	3,148	2,597
Operating Income (Loss)	1,801	1,604	2,804	2,005
Total assets	91,907	88,181	91,907	88,181
Operating \| Corporate entities
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Depreciation and amortization	584	631	1,190	1,331
Operating Income (Loss)	(586)	(659)	(1,194)	(1,368)
Total assets	37,294	34,861	37,294	34,861
Inter-company revenues
Segment Reporting Information [Line Items]
Revenues	(45,305)	(41,914)	(85,583)	(75,290)
Inter-company revenues \| Eastern
Segment Reporting Information [Line Items]
Revenues	13,837	14,678	25,676	25,449
Inter-company revenues \| Western
Segment Reporting Information [Line Items]
Revenues	29,020	24,496	54,566	44,714
Inter-company revenues \| Resource Solutions
Segment Reporting Information [Line Items]
Revenues	2,448	2,740	5,341	5,127
Inter-company revenues \| Corporate entities
Segment Reporting Information [Line Items]
Revenues	$ 0	$ 0	$ 0	$ 0

SEGMENT REPORTING - Summary of Revenues Attributable to Services Provided by Company (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue from External Customer [Line Items]
Revenues	$ 188,767	$ 187,459	$ 371,676	$ 351,123
Solid waste operations
Revenue from External Customer [Line Items]
Revenues	140,622	142,824	275,970	263,972
Collection
Revenue from External Customer [Line Items]
Revenues	94,008	92,066	188,584	175,145
Disposal
Revenue from External Customer [Line Items]
Revenues	43,746	48,139	82,371	84,194
Power generation
Revenue from External Customer [Line Items]
Revenues	918	711	1,944	1,847
Processing
Revenue from External Customer [Line Items]
Revenues	1,950	1,908	3,071	2,786
Resource solutions operations
Revenue from External Customer [Line Items]
Revenues	48,145	44,635	95,706	87,151
Organics
Revenue from External Customer [Line Items]
Revenues	15,419	14,905	30,351	28,501
Customer solutions
Revenue from External Customer [Line Items]
Revenues	20,239	19,216	41,902	37,370
Recycling
Revenue from External Customer [Line Items]
Revenues	$ 12,487	$ 10,514	$ 23,453	$ 21,280