10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 2022

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                      to                     

Commission file number 000-23211

CASELLA WASTE SYSTEMS, INC.

(Exact name of registrant as specified in its charter)

Delaware	03-0338873
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

25 Greens Hill Lane,
Rutland,	Vermont	05701
(Address of principal executive offices)		(Zip Code)

Registrant’s telephone number, including area code: (802) 775-0325

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Class A common stock, $0.01 par value per share	CWST	The Nasdaq Stock Market LLC
		(Nasdaq Global Select Market)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ☒    No  ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).    Yes  ☒    No  ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company," and "emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer ☒ Accelerated filer ☐

Non-accelerated filer ☐ Smaller reporting company ☐

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes ☐ No  ☒

The number of shares outstanding of each of the registrant’s classes of common stock, as of July 15, 2022:

Class A common stock, $0.01 par value per share:	50,689,841
Class B common stock, $0.01 par value per share:	988,200

PART I.

ITEM 1.    FINANCIAL STATEMENTS

CASELLA WASTE SYSTEMS, INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

(in thousands)

	June 30, 2022		December 31, 2021
	(Unaudited)
ASSETS
CURRENT ASSETS:
Cash and cash equivalents	$	39,309	$	33,809
Accounts receivable, net of allowance for credit losses of $3,879 and $3,276, respectively	108,313		86,979
Prepaid expenses	17,517		12,766
Inventory	13,071		9,729
Other current assets	2,946		3,196
Total current assets	181,156		146,479
Property, plant and equipment, net of accumulated depreciation and amortization of $1,016,382 and $973,094, respectively	668,381		644,604
Operating lease right-of-use assets	93,253		93,799
Goodwill	262,508		232,860
Intangible assets, net	96,762		93,723
Restricted cash and assets	2,805		2,122
Cost method investments	11,264		11,264
Deferred income taxes	34,060		43,957
Other non-current assets	20,530		14,772
Total assets	$	1,370,719	$	1,283,580

The accompanying notes are an integral part of these consolidated financial statements.

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CASELLA WASTE SYSTEMS, INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS (Continued)

(in thousands, except for share and per share data)

	June 30, 2022		December 31, 2021
	(Unaudited)
LIABILITIES AND STOCKHOLDERS' EQUITY
CURRENT LIABILITIES:
Current maturities of debt	$	7,636	$	9,901
Current operating lease liabilities	6,425		7,307
Accounts payable	73,270		63,086
Accrued payroll and related expenses	16,392		22,210
Accrued interest	2,372		2,042
Contract liabilities	3,733		3,404
Current accrued capping, closure and post-closure costs	5,815		7,915
Other accrued liabilities	47,371		36,328
Total current liabilities	163,014		152,193
Debt, less current portion	575,556		542,503
Operating lease liabilities, less current portion	59,027		56,375
Accrued capping, closure and post-closure costs, less current portion	86,558		78,999
Deferred income taxes	902		868
Other long-term liabilities	28,096		30,185
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' EQUITY:
Class A common stock, $0.01 par value per share; 100,000,000 shares authorized; 50,690,000 and 50,423,000 shares issued and outstanding, respectively	507		504
Class B common stock, $0.01 par value per share; 1,000,000 shares authorized; 988,000 shares issued and outstanding, respectively; 10 votes per share	10		10
Additional paid-in capital	656,042		652,045
Accumulated deficit	(203,013)		(224,999)
Accumulated other comprehensive income (loss), net of tax	4,020		(5,103)
Total stockholders' equity	457,566		422,457
Total liabilities and stockholders' equity	$	1,370,719	$	1,283,580

The accompanying notes are an integral part of these consolidated financial statements.

2

CASELLA WASTE SYSTEMS, INC. AND SUBSIDIARIES

UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS

(in thousands, except for per share data)

	Three Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
Revenues	$	283,666	$	215,875	$	517,693	$	405,406
Operating expenses:
Cost of operations	186,038		138,553		348,493		265,691
General and administration	33,562		29,212		63,354		56,343
Depreciation and amortization	31,150		24,337		60,579		47,019
Expense from acquisition activities	1,019		1,632		3,062		2,046
Southbridge Landfill closure charge	178		195		318		352
	251,947		193,929		475,806		371,451
Operating income	31,719		21,946		41,887		33,955
Other expense (income):
Interest income	(42)		(66)		(81)		(130)
Interest expense	5,698		5,296		10,902		10,764
Other income	(312)		(510)		(457)		(648)
Other expense, net	5,344		4,720		10,364		9,986
Income before income taxes	26,375		17,226		31,523		23,969
Provision for income taxes	8,579		5,443		9,537		7,875
Net income	$	17,796	$	11,783	$	21,986	$	16,094
Basic earnings per share attributable to common stockholders:
Weighted average common shares outstanding	51,642		51,366		51,567		51,273
Basic earnings per common share	$	0.34	$	0.23	$	0.43	$	0.31
Diluted earnings per share attributable to common stockholders:
Weighted average common shares outstanding	51,781		51,546		51,720		51,466
Diluted earnings per common share	$	0.34	$	0.23	$	0.43	$	0.31

The accompanying notes are an integral part of these consolidated financial statements.

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CASELLA WASTE SYSTEMS, INC. AND SUBSIDIARIES

UNAUDITED CONSOLIDATED STATEMENTS OF

COMPREHENSIVE INCOME

(in thousands)

	Three Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
Net income	$	17,796	$	11,783	$	21,986	$	16,094
Other comprehensive income (loss), before tax:
Hedging activity:
Interest rate swap settlements	(932)		(1,186)		(2,095)		(2,346)
Interest rate swap amounts reclassified into interest expense	994		1,202		2,122		2,347
Unrealized gain (loss) resulting from changes in fair value of derivative instruments	3,488		(336)		11,869		4,651
Other comprehensive income (loss), before tax	3,550		(320)		11,896		4,652
Income tax provision (benefit) related to items of other comprehensive income	570		(85)		2,773		1,057
Other comprehensive income (loss), net of tax	2,980		(235)		9,123		3,595
Comprehensive income	$	20,776	$	11,548	$	31,109	$	19,689

The accompanying notes are an integral part of these consolidated financial statements.

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CASELLA WASTE SYSTEMS, INC. AND SUBSIDIARIES

UNAUDITED CONSOLIDATED STATEMENTS OF

STOCKHOLDERS' EQUITY

(in thousands)

			Casella Waste Systems, Inc. Stockholders' Equity
			Class A Common Stock			Class B Common Stock			Additional Paid-In Capital		Accumulated Deficit		Accumulated Other Comprehensive Income (Loss)
	Total		Shares	Amount		Shares	Amount
Balance, December 31, 2021	$	422,457	50,423	$	504	988	$	10	$	652,045	$	(224,999)	$	(5,103)
Issuances of Class A common stock	19		227	2		—	—		17		—		—
Stock-based compensation	2,241		—	—		—	—		2,241		—		—
Comprehensive income:
Net income	4,190		—	—		—	—		—		4,190		—
Other comprehensive income:
Hedging activity	6,143		—	—		—	—		—		—		6,143
Balance, March 31, 2022	435,050		50,650	506		988	10		654,303		(220,809)		1,040
Issuances of Class A common stock	803		40	1		—	—		802		—		—
Stock-based compensation	937		—	—		—	—		937		—		—
Comprehensive income:
Net income	17,796		—	—		—	—		—		17,796		—
Other comprehensive income:
Hedging activity	2,980		—	—		—	—		—		—		2,980
Balance, June 30, 2022	$	457,566	50,690	$	507	988	$	10	$	656,042	$	(203,013)	$	4,020

			Class A Common Stock			Class B Common Stock			Additional Paid-In Capital		Accumulated Deficit		Accumulated Other Comprehensive Loss
	Total		Shares	Amount		Shares	Amount
Balance, December 31, 2020	$	362,142	50,101	$	501	988	$	10	$	639,247	$	(266,099)	$	(11,517)
Issuances of Class A common stock	112		273	3		—	—		109		—		—
Stock-based compensation	2,941		—	—		—	—		2,941		—		—
Comprehensive income:
Net income	4,311		—	—		—	—		—		4,311		—
Other comprehensive income:
Hedging activity	3,830		—	—		—	—		—		—		3,830
Balance, March 31, 2021	373,336		50,374	504		988	10		642,297		(261,788)		(7,687)
Issuances of Class A common stock	492		24	—		—	—		492		—		—
Stock-based compensation	3,116		—	—		—	—		3,116		—		—
Comprehensive income:
Net income	11,783		—	—		—	—		—		11,783		—
Other comprehensive loss:
Hedging activity	(235)		—	—		—	—		—		—		(235)
Balance, June 30, 2021	$	388,492	50,398	$	504	988	$	10	$	645,905	$	(250,005)	$	(7,922)

The accompanying notes are an integral part of these consolidated financial statements.

5

CASELLA WASTE SYSTEMS, INC. AND SUBSIDIARIES

UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)

	Six Months Ended June 30,
	2022		2021
Cash Flows from Operating Activities:
Net income	$	21,986	$	16,094
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	60,579		47,019
Interest accretion on landfill and environmental remediation liabilities	4,015		3,962
Amortization of debt issuance costs	924		1,144
Stock-based compensation	3,178		6,057
Operating lease right-of-use assets expense	6,824		6,407
Gain on sale of property and equipment	(269)		(92)
Non-cash expense from acquisition activities	645		1,022
Deferred income taxes	7,156		7,041
Changes in assets and liabilities, net of effects of acquisitions and divestitures:
Accounts receivable	(14,667)		(4,712)
Landfill operating lease contract expenditures	(1,308)		(1,478)
Accounts payable	10,142		10,866
Prepaid expenses, inventories and other assets	(6,099)		(7,192)
Accrued expenses, contract liabilities and other liabilities	(855)		(7,125)
Net cash provided by operating activities	92,251		79,013
Cash Flows from Investing Activities:
Acquisitions, net of cash acquired	(56,250)		(5,481)
Additions to property, plant and equipment	(54,868)		(56,069)
Proceeds from sale of property and equipment	507		403
Net cash used in investing activities	(110,611)		(61,147)
Cash Flows from Financing Activities:
Proceeds from debt borrowings	82,200		500
Principal payments on debt	(55,297)		(5,643)
Payments of debt issuance costs	(1,229)		—
Payments of contingent consideration	(1,000)		—
Proceeds from the exercise of share based awards	192		112
Net cash provided by (used in) financing activities	24,866		(5,031)
Net increase in cash and cash equivalents	6,506		12,835
Cash, cash equivalents and restricted cash, beginning of period	33,809		154,342
Cash, cash equivalents and restricted cash, end of period	$	40,315	$	167,177
Supplemental Disclosure of Cash Flow Information:
Cash interest payments	$	9,648	$	9,701
Cash income tax payments	$	2,092	$	411
Non-current assets obtained through long-term financing obligations	$	4,190	$	5,894
Right-of-use assets obtained in exchange for operating lease obligations	$	5,194	$	1,251

The accompanying notes are an integral part of these consolidated financial statements.

6

CASELLA WASTE SYSTEMS, INC. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

(in thousands, except for per share data)

1.    BASIS OF PRESENTATION

Casella Waste Systems, Inc. (“Parent”), and its subsidiaries (collectively, “we”, “us” or “our”), is a regional, vertically integrated solid waste services company. We provide resource management expertise and services to residential, commercial, municipal, institutional and industrial customers, primarily in the areas of solid waste collection and disposal, transfer, recycling and organics services. We provide integrated solid waste services in seven states: Vermont, New Hampshire, New York, Massachusetts, Connecticut, Maine and Pennsylvania, with our headquarters located in Rutland, Vermont. We 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. We manage our resource-renewal operations through the Resource Solutions operating segment, which leverages our core competencies in materials processing, industrial recycling, organics and resource management service offerings to deliver a comprehensive solution for our larger commercial, municipal, institutional and industrial customers that have more diverse waste and recycling needs. Legal, tax, information technology, human resources, certain finance and accounting and other administrative functions are included in our Corporate Entities segment.

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, "Financial Statements and Supplementary Data" of our Annual Report on Form 10-K for the fiscal year ended December 31, 2021 ("fiscal year 2021"), which was filed with the SEC on February 18, 2022.

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, 2022 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 fiscal year 2021.

Subsequent Events

We have evaluated subsequent events or transactions that have occurred after the consolidated balance sheet date of June 30, 2022 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.

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2.    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 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), as amended through January 2021	Provides temporary optional guidance to ease the potential burden in applying GAAP to contract modifications and hedging relationships that reference London Inter-Bank Offered Rate ("LIBOR") or another reference rate expected to be discontinued, subject to meeting certain criteria.	We currently have interest rate derivative agreements with hedging relationships that reference LIBOR. This guidance provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. We are currently assessing the provisions of this guidance, and reviewing and updating our existing contracts, as applicable, for transition or fallback language that specifies how a replacement rate for LIBOR will be identified. We are also no longer using LIBOR as a reference rate for any new contracts. We do not expect that the adoption of this guidance will have a material impact on our consolidated financial statements and related disclosures. This guidance will be in effect from March 12, 2020 through December 31, 2022. See Note 7, Debt for further disclosure over our interest rate derivative agreements and debt instruments that reference LIBOR.
ASU No. 2021-08: Accounting for Contract Assets and Contract Liabilities from Contracts with Customers (Topic 805)	Requires entities to apply ASC 606 to recognize and measure contract assets and contract liabilities in a business combination. This guidance improves comparability after the business combination by providing consistent recognition and measurement guidance for revenue contracts with customers acquired in a business combination and revenue contracts with customers not acquired in a business combination.	We have made in the past, and we may make in the future, acquisitions to densify existing operations, expand service areas, and grow services for our customers, and these acquisitions may include contract assets or contract liabilities. We do not expect that the adoption of this guidance will have a material impact on our consolidated financial statements and related disclosures. This guidance is effective January 1, 2023 with early adoption permitted.

3.    REVENUE RECOGNITION

Revenues associated with our solid waste operations are derived mainly from solid waste collection and disposal services, including landfill, transfer station and transportation services, landfill gas-to-energy services, and processing services. Revenues associated with our resource-renewal services are derived from processing and non-processing services.

The following tables set forth revenues disaggregated by service line and timing of revenue recognition by operating segment for each of the three and six months ended June 30, 2022 and 2021:

8

Three Months Ended June 30, 2022

	Eastern		Western		Resource Solutions		Total Revenues
Collection	$	59,299	$	77,962	$	—	$	137,261
Landfill	6,542		18,599		—		25,141
Transfer	17,292		11,982		—		29,274
Transportation	1,765		4,024		—		5,789
Landfill gas-to-energy	249		1,504		—		1,753
Processing	2,116		813		33,867		36,796
Non-processing	—		—		47,652		47,652
Total revenues	$	87,263	$	114,884	$	81,519	$	283,666
Transferred at a point-in-time	$	117	$	517	$	18,813	$	19,447
Transferred over time	87,146		114,367		62,706		264,219
Total revenues	$	87,263	$	114,884	$	81,519	$	283,666

Three Months Ended June 30, 2021

	Eastern		Western		Resource Solutions		Total Revenues
Collection	$	39,364	$	67,963	$	—	$	107,327
Landfill	6,118		16,517		—		22,635
Transfer	13,475		9,976		—		23,451
Transportation	47		3,040		—		3,087
Landfill gas-to-energy	246		854		—		1,100
Processing	1,808		502		21,031		23,341
Non-processing	—		—		34,934		34,934
Total revenues	$	61,058	$	98,852	$	55,965	$	215,875
Transferred at a point-in-time	$	38	$	487	$	14,944	$	15,469
Transferred over time	61,020		98,365		41,021		200,406
Total revenues	$	61,058	$	98,852	$	55,965	$	215,875

Six Months Ended June 30, 2022

	Eastern		Western		Resource Solutions		Total Revenues
Collection	$	110,796	$	145,997	$	—	$	256,793
Landfill	11,918		32,788		—		44,706
Transfer	28,905		19,825		—		48,730
Transportation	3,238		6,682		—		9,920
Landfill gas-to-energy	522		3,885		—		4,407
Processing	3,203		1,546		61,263		66,012
Non-processing	—		—		87,125		87,125
Total revenues	$	158,582	$	210,723	$	148,388	$	517,693
Transferred at a point-in-time	$	236	$	1,028	$	33,900	$	35,164
Transferred over time	158,346		209,695		114,488		482,529
Total revenues	$	158,582	$	210,723	$	148,388	$	517,693

Six Months Ended June 30, 2021

9

	Eastern		Western		Resource Solutions		Total Revenues
Collection	$	75,440	$	129,356	$	—	$	204,796
Landfill	11,520		30,136		—		41,656
Transfer	22,899		17,123		—		40,022
Transportation	95		5,253		—		5,348
Landfill gas-to-energy	515		1,888		—		2,403
Processing	2,934		860		38,302		42,096
Non-processing	—		—		69,085		69,085
Total revenues	$	113,403	$	184,616	$	107,387	$	405,406
Transferred at a point-in-time	$	82	$	988	$	25,036	$	26,106
Transferred over time	113,321		183,628		82,351		379,300
Total revenues	$	113,403	$	184,616	$	107,387	$	405,406

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 $5,908 and $9,702 in the three and six months ended June 30, 2022, respectively, and $2,532 and $4,100 in the three and six months ended June 30, 2021, 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, 2022 or June 30, 2021 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 $111,601 and $89,232 as of June 30, 2022 and December 31, 2021, 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 $3,733 and $3,404 as of June 30, 2022 and December 31, 2021, 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, 2021 and December 31, 2020 was recognized as revenue during the six months ended June 30, 2022 and June 30, 2021, respectively, when the services were performed.

4.    BUSINESS COMBINATIONS

In the six months ended June 30, 2022, we acquired the following businesses: a full service solid-waste collection, recycling and transportation business in our Resource Solutions operating segment; a closed waste-to-energy facility that is being decommissioned and rebuilt as a transfer station and four tuck-in solid waste collection businesses in our Western region; a portable toilets business in our Eastern region; and a scrap metal collection business whose assets are allocated between our Eastern region and Resource Solutions operating segments. In the six months ended June 30, 2021, we acquired two tuck-in solid waste collection businesses in our Western region, along with a septic and portable toilet business and a tuck-in solid waste collection business in our Eastern region.

The operating results of these 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. Purchase price allocations are based on information existing at the acquisition dates or upon closing the transactions, including contingent consideration. Acquired intangible assets other than goodwill that are subject to amortization include customer relationships, trade names and covenants not-to-compete. Such assets are amortized over a four-year to ten-year period from the date of acquisition. All amounts recorded to goodwill are expected to be deductible for tax purposes.

10

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

	Six Months Ended June 30,
	2022		2021
Purchase Price:
Cash used in acquisitions, net of cash acquired	$	55,053	$	4,378
Holdbacks	3,842		505
Total consideration	58,895		4,883
Allocated as follows:
Current assets	7,584		13
Property, plant and equipment:
Land	2,804		—
Buildings and improvements	5,308		—
Equipment	6,712		1,549
Operating lease right-of-use assets	405		—
Intangible assets:
Covenants not-to-compete	1,415		420
Customer relationships	9,725		1,226
Other non-current assets	40		—
Current liabilities	(3,577)		(82)
Operating lease liabilities, less current portion	(282)		—
Fair value of assets acquired and liabilities assumed	30,134		3,126
Excess purchase price allocated to goodwill	$	28,761	$	1,757

Certain purchase price allocations are preliminary and are based on information existing at the acquisition dates or upon closing the transaction. Accordingly, the 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, 2021 is as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
Revenues	$	284,314	$	246,623	$	525,012	$	467,326
Operating income	$	31,776	$	22,612	$	42,716	$	35,334
Net income	$	17,787	$	9,952	$	22,025	$	12,457
Basic earnings per share attributable to common stockholders:
Weighted average common shares outstanding	51,642		51,366		51,567		51,273
Basic earnings per common share	$	0.34	$	0.19	$	0.43	$	0.24
Diluted earnings per share attributable to common stockholders:
Weighted average common shares outstanding	51,781		51,546		51,720		51,466
Diluted earnings per common share	$	0.34	$	0.19	$	0.43	$	0.24

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, 2021 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.

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5.    GOODWILL AND INTANGIBLE ASSETS

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

	December 31, 2021		Acquisitions		Adjustments to Acquisitions		June 30, 2022
Eastern	$	52,072	$	93	$	237	$	52,402
Western	163,728		7,350		650		171,728
Resource Solutions	17,060		21,318		—		38,378
Total	$	232,860	$	28,761	$	887	$	262,508

Summaries of intangible assets by type follows:

	Covenants Not-to-Compete		Customer Relationships		Trade Names		Total
Balance, June 30, 2022
Intangible assets	$	30,193	$	124,680	$	8,350	$	163,223
Less accumulated amortization	(23,094)		(40,296)		(3,071)		(66,461)
	$	7,099	$	84,384	$	5,279	$	96,762

	Covenants Not-to-Compete		Customer Relationships		Trade Names		Total
Balance, December 31, 2021
Intangible assets	$	28,777	$	115,005	$	8,350	$	152,132
Less accumulated amortization	(22,148)		(34,809)		(1,452)		(58,409)
	$	6,629	$	80,196	$	6,898	$	93,723

Intangible amortization expense was $4,262 and $8,052 during the three and six months ended June 30, 2022, respectively, and $2,015 and $4,043 during the three and six months ended June 30, 2021, respectively.

A summary of intangible amortization expense estimated for the five fiscal years following fiscal year 2021 and thereafter follows:

Estimated Future Amortization Expense as of June 30, 2022
Fiscal year ending December 31, 2022	$	8,158
Fiscal year ending December 31, 2023	$	15,600
Fiscal year ending December 31, 2024	$	14,879
Fiscal year ending December 31, 2025	$	13,758
Fiscal year ending December 31, 2026	$	12,123
Thereafter	$	32,244

6.    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.

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

	Six Months Ended June 30,
	2022		2021
Beginning balance	$	86,914	$	82,533
Obligations incurred	2,244		2,319
Revision in estimates (1)	1,443		—
Accretion expense	3,799		3,676
Obligations settled (2)	(2,027)		(2,969)
Ending balance	$	92,373	$	85,559

(1)Relates to a change in estimates concerning anticipated capping costs at one of our landfills.

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

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7.    DEBT

A summary of debt is as follows:

	June 30, 2022		December 31, 2021
Senior Secured Credit Facility:
Term loan A facility ("Term Loan Facility") due December 2026; bearing interest at LIBOR plus 1.375%	$	350,000	$	350,000
Revolving credit facility due December 2026 ("Revolving Credit Facility"); bearing interest at LIBOR plus 1.375%	—		—
Tax-Exempt Bonds:
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014 ("New York Bonds 2014R-1") due December 2044 - fixed rate interest period through 2029; 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
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2020 ("New York Bonds 2020") due September 2050 - fixed rate interest period through 2025; bearing interest at 2.750%	40,000		40,000
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 2013") due April 2036 - fixed rate interest period through 2028; bearing interest at 4.625%	16,000		16,000
Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2022A-1 ("Vermont Bonds 2022A-1") due June 2052 - fixed rate interest period through 2027; bearing interest at 5.00%	35,000		—
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 3.6%	45,889		45,724
Notes payable maturing through August 2024; bearing interest at a weighted average of 1.6%	773		4,846
Principal amount of debt	593,662		562,570
Less—unamortized debt issuance costs (1)	10,470		10,166
Debt less unamortized debt issuance costs	583,192		552,404
Less—current maturities of debt	7,636		9,901
	$	575,556	$	542,503

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

	June 30, 2022		December 31, 2021
Revolving Credit Facility and Term Loan Facility (collectively, the "Credit Facility")	$	5,306	$	5,884
New York Bonds 2014R-1	899		933
New York Bonds 2014R-2	238		268
New York Bonds 2020	1,194		1,283
FAME Bonds 2005R-3	219		262
FAME Bonds 2015R-1	378		413
FAME Bonds 2015R-2	231		268
Vermont Bonds 2013	405		433
Vermont Bonds 2022A-1	1,207		—
New Hampshire Bonds	393		422
	$	10,470	$	10,166

Financing Activities

In the three months ended June 30, 2022, we completed the issuance of $35,000 aggregate principal amount of Vermont Bonds 2022A-1. The Vermont Bonds 2022A-1, which are unsecured and guaranteed jointly and severally, fully and unconditionally by all of our significant wholly-owned subsidiaries, accrue interest at 5.00% per annum from June 1, 2022 through May 31, 2027, at which time they may be converted to a variable interest rate period or to a new term interest rate period. The Vermont Bonds 2022A-1 mature on June 1, 2052. As of June 30, 2022, we had $1,006 of remaining cash proceeds from the issuance of the Vermont Bonds 2022A-1 included in restricted cash and assets that is restricted to finance or reimburse certain noncurrent asset costs associated with capital projects in the State of Vermont.

Credit Facility

As of June 30, 2022, we are party to an amended and restated credit agreement ("Credit Agreement"), which provides for a $350,000 aggregate principal amount Term Loan Facility and a $300,000 Revolving Credit Facility, with a $75,000 sublimit for letters of credit. 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 December 2026 and bears interest at a rate of LIBOR plus 1.375% per annum, which will be reduced to a rate of LIBOR plus as low as 1.125% upon us reaching a consolidated net leverage ratio of less than 2.25x. The Credit Agreement contains customary benchmark replacement provisions pursuant to which, upon certain triggering events, the LIBOR benchmark used to calculate the LIBOR rate will be replaced with a secured overnight financing rate, as adjusted, on the terms and conditions in the Credit Agreement. 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, 2022, further advances were available under the Revolving Credit Facility in the amount of $271,805. The available amount is net of outstanding irrevocable letters of credit totaling $28,195, and as of June 30, 2022 no amount had been drawn.

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. We have designated these derivative instruments as highly effective cash flow hedges, and therefore the change in their fair value is recorded in stockholders’ equity as a component of accumulated other comprehensive income (loss), net of tax 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.

As of June 30, 2022 and December 31, 2021, our active interest rate derivative agreements had total notional amounts of $190,000 and $195,000, respectively. According to the terms of the agreements, we receive interest based on the 1-month LIBOR index, in some instances restricted by a 0.0% floor, and pay interest at a weighted average rate of approximately 2.20%. The agreements mature between May 2023 and June 2027.

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As of December 31, 2021, we had forward starting interest rate derivative agreements with a total notional amount of $85,000 outstanding. As of June 30, 2022, we have a forward starting interest rate derivative agreement with a total notional amount of $20,000 after considering any forward starting interest rate derivative agreements that became effective in the current period. According to the terms of this agreement, we will receive interest based on the 1-month LIBOR index, restricted by a 0.0% floor, and will pay interest at a rate of 1.29%. The agreement matures in May 2028.

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, 2022		December 31, 2021
Interest rate swaps	Other current assets	$	1,454	$	—
Interest rate swaps	Other non-current assets	5,508		424
		$	6,962	$	424
Interest rate swaps	Other accrued liabilities	$	—	$	3,796
Interest rate swaps	Other long-term liabilities	—		1,380
		$	—	$	5,176
Interest rate swaps	Accumulated other comprehensive income (loss), net of tax	$	6,962	$	(4,935)
Interest rate swaps - tax effect	Accumulated other comprehensive income (loss), net of tax	(2,942)		(168)
		$	4,020	$	(5,103)

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

	Three Months Ended June 30,				Six Months Ended June 30,
Statement of Operations Location	2022		2021		2022		2021
Interest expense	$	994	$	1,202	$	2,122	$	2,347

8.    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. The plaintiffs in some actions seek unspecified damages or injunctive relief, or both. These actions fall within various procedural stages at any point in time, and some are covered in part by insurance.

In accordance with FASB ASC 450 - Contingencies, we accrue for legal proceedings, inclusive of legal costs, when losses become probable and reasonably estimable. We have recorded an aggregate accrual of $1,291 relating to our outstanding legal proceedings as of June 30, 2022. 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

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FASB ASC 450-20. We disclose outstanding matters that we believe could have a material adverse effect on our financial condition, results of operations or cash flows.

North Country Environmental Services Expansion Permit

On October 9, 2020, our subsidiary, North Country Environmental Services, Inc. ("NCES"), received a Type I-A Permit Modification (the "Permit") for Expansion in the Stage VI area of the NCES landfill located in Bethlehem, New Hampshire. On November 9, 2020, the Conservation Law Foundation ("CLF") filed an appeal of the Permit to the New Hampshire Waste Management Council (the “Council”) on the grounds it failed to meet the public benefit criteria. On January 19, 2021, CLF filed a Complaint for Injunctive Relief with the Grafton Superior Court to enjoin NCES from accepting waste pursuant to the new Permit until such a time as CLF has exhausted its appeal rights. A hearing on the Complaint for Injunctive Relief was held on March 10, 2021; the Grafton Superior Court denied the motion on May 14, 2021. CLF did not appeal this decision. The Council denied NCES’s Motion to Dismiss CLF’s appeal for lack of standing by Order dated March 17, 2021. NCES filed a Motion to Reconsider on March 26, 2021, which was denied by the Council on May 11, 2021. A prehearing conference was held and a schedule for the case was established on June 8, 2021. NCES filed a Motion to Dismiss on the merits of the appeal on June 30, 2021. On July 16, 2021, CLF filed its objection to the Motion to Dismiss, and NCES filed its reply on July 26, 2021. The Council issued an Order on September 3, 2021 granting NCES’s Motion to Dismiss, in part. CLF filed a Motion for Reconsideration on September 23, 2021, and NCES filed its objection on September 28, 2021 and CLF filed a reply on September 30, 2021. CLF’s Motion for Reconsideration was granted on November 19, 2021, and its dismissed claims reinstated. On January 14, 2022, NCES filed a Motion in Limine seeking to exclude from evidence four potential evidentiary items on the basis that those items were either not directly related, or were not included in CLF’s Notice of Appeal. On January 21, 2022, CLF filed an objection to NCES’s motion, and NCES filed a reply on January 26, 2022. On January 31, 2022, the Council issued an Order granting NCES’s Motion in Limine with respect to three of the four items it sought to exclude from evidence, and denying its motion with respect to the remaining item. On February 18 and February 22, 2022, a quorum of the Council and Hearing Officer held a hearing on the appeal. Council deliberations occurred and were concluded on February 22, 2022,with the Council ruling in favor of NCES on all motions concerning questions of fact, and indicating that a written decision incorporating the Hearing Officer’s decision as to questions of law would follow. On May 11, 2022, an Order was issued denying all of CLF’s arguments on appeal, with the exception of one; the Hearing Officer held that based on his interpretation of the relevant statute, the public benefit determination made by the New Hampshire Department of Environmental Services (“DES”), in issuing the Permit to NCES, was unlawful, and remanded the Permit to the DES with regard to this determination. DES filed a Motion for Reconsideration with the Council on May 31, 2022 (the “DES Reconsideration Motion”) and NCES filed a Motion for Rehearing on June 10, 2022 (the “NCES Rehearing Motion”). The Hearing Officer suspended his May 11, 2022 decision by Order dated June 20, 2022, pending consideration of the DES Reconsideration Motion and NCES Rehearing Motion. On June 24, 2022, CLF filed an Objection and Motion to Strike with respect to the NCES Rehearing Motion as well as an Objection to the DES Reconsideration Motion, and DES filed a Limited Objection to the NCES Rehearing Motion, each to which NCES submitted a Reply on July 6, 2022. On July 18, 2022, CLF filed a Reply in Support of its Motion to Strike and Limited Surreply in Support of Objection to the NCES Motion for Rehearing. On July 21, 2022, NCES filed an Assented to Motion for Leave to File Limited Surreply to CLF’s Motion to Strike together with a Limited Surreply to CLF’s Motion to Strike. The outcome remains pending. NCES will continue to vigorously defend against this litigation.

Environmental Remediation Liabilities

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.

We accrue for costs associated with environmental remediation obligations when such costs become both probable and reasonably estimable. Determining the method and ultimate cost of remediation requires that a number of assumptions be made. There can sometimes be a range of reasonable estimates of the costs associated with remediation of a site. In these cases, we use the amount within the range that constitutes our best estimate. In the early stages of the remediation process, particular components of the overall liability may not be reasonably estimable; in this instance we use the components of the liability that can be reasonably estimated as a surrogate for the liability. It is reasonably possible that we will need to adjust the liabilities recorded for remediation to reflect the effects of new or additional information, to the extent such information impacts the costs, timing or duration of the required actions. Future changes in our estimates of the cost, timing or duration of the required actions could have a material adverse effect on our consolidated financial position, results of operations and cash flows. We disclose outstanding environmental remediation matters that remain unsettled or are settled in the reporting period that we believe could have a material adverse effect on our financial condition, results of operations or cash flows.

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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. The weighted average risk-free interest rate associated with our environmental remediation liabilities as of June 30, 2022 ranges between 1.5% and 2.6%. A summary of the changes to the aggregate environmental remediation liabilities for the six months ended June 30, 2022 and 2021 follows:

	Six Months Ended June 30,
	2022		2021
Beginning balance	$	5,887	$	5,200
Accretion expense	54		56
Obligations settled (1)	(72)		(281)
Ending balance	5,869		4,975
Less: current portion	280		375
Long-term portion	$	5,589	$	4,600

(1)May include amounts paid and amounts that are being processed through accounts payable as a part of our disbursement cycle.

9.    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, 2022, there were 868 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, 2021	77	$	15.68
Granted	—	$	—
Exercised	(23)	$	8.56
Forfeited	—	$	—
Outstanding, June 30, 2022	54	$	18.62	4.3	$	2,946
Exercisable, June 30, 2022	46	$	9.49	3.5	$	2,913

Stock-based compensation expense related to stock options was $17 and $33 during the three and six months ended June 30, 2022, respectively. We did not record any stock-based compensation expense for stock options during the three and six months ended June 30, 2021. As of June 30, 2022, we had $139 of unrecognized stock-based compensation expense related to outstanding stock options to be recognized over a weighted average period of 2.1 years.

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During the three and six months ended June 30, 2022, the aggregate intrinsic value of stock options exercised was $1,156 and $1,467, 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, if applicable, 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, 2021	249	$	55.40
Granted	82	$	94.31
Class A Common Stock Vested	(63)	$	49.00
Forfeited	(34)	$	67.73
Outstanding, June 30, 2022	234	$	68.86	1.9	$	17,031
Unvested, June 30, 2022	418	$	68.97	1.6	$	30,407

(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 184 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 $828 and $2,979 during the three and six months ended June 30, 2022, respectively, as compared to $3,044 and $5,928 during the three and six months ended June 30, 2021, respectively.

During the three and six months ended June 30, 2022, the total fair value of other stock awards vested was $814 and $5,359, respectively.

As of June 30, 2022, total unrecognized stock-based compensation expense related to outstanding restricted stock was $58, which will be recognized over a weighted average period of 1.5 years. As of June 30, 2022, total unrecognized stock-based compensation expense related to outstanding restricted stock units was $5,543, which will be recognized over a weighted average period of 1.9 years. As of June 30, 2022, total expected unrecognized stock-based compensation expense related to outstanding performance stock units was $6,882 to be recognized over a weighted average period of 1.8 years.

We also recorded $93 and $166 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, 2022, respectively, as compared to $72 and $128 during the three and six months ended June 30, 2021, respectively.

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Accumulated Other Comprehensive Income (Loss), Net of Tax

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

	Interest Rate Swaps
Balance, December 31, 2021	$	(5,103)
Other comprehensive income before reclassifications	9,774
Amounts reclassified from accumulated other comprehensive income (loss)	2,122
Income tax provision related to items of other comprehensive income	(2,773)
Net current-period other comprehensive income	9,123
Balance, June 30, 2022	$	4,020

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

	Three Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
Details About Accumulated Other Comprehensive Income (Loss), Net of Tax Components	Amounts Reclassified Out of Accumulated Other Comprehensive Income (Loss), Net of Tax								Affected Line Item in the Consolidated Statements of Operations
Interest rate swaps	$	994	$	1,202	$	2,122	$	2,347	Interest expense
	(994)		(1,202)		(2,122)		(2,347)		Income before income taxes
	—		(142)		(190)		(269)		Provision for income taxes
	$	(994)	$	(1,060)	$	(1,932)	$	(2,078)	Net income

10.    EARNINGS PER SHARE

Basic 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.

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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,
	2022		2021		2022		2021
Numerator:
Net income	$	17,796	$	11,783	$	21,986	$	16,094
Denominators:
Number of shares outstanding, end of period:
Class A common stock	50,690		50,398		50,690		50,398
Class B common stock	988		988		988		988
Unvested restricted stock	(2)		(2)		(2)		(2)
Effect of weighted average shares outstanding	(34)		(18)		(109)		(111)
Basic weighted average common shares outstanding	51,642		51,366		51,567		51,273
Impact of potentially dilutive securities:
Dilutive effect of stock options and other stock awards	139		180		153		193
Diluted weighted average common shares outstanding	51,781		51,546		51,720		51,466
Anti-dilutive potentially issuable shares	70		—		70		48

11.    OTHER ITEMS AND CHARGES

Expense from Acquisition Activities

In the three and six months ended June 30, 2022, we recorded charges of $1,019 and $3,062, respectively, and in the three and six months ended June 30, 2021, we recorded charges of $1,632 and $2,046, respectively, comprised primarily of legal, consulting and other similar costs associated with due diligence and the acquisition and integration of acquired businesses or select development projects.

12.    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 derivatives, contingent consideration related to acquisitions, trade payables and debt. The carrying values of cash and cash equivalents, restricted cash, 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 derivatives 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. We recognize all derivatives accounted for on the balance sheet at fair value.

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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, 2022 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	$	1,799	$	—	$	—
Interest rate swaps	—		6,962		—
	$	1,799	$	6,962	$	—

	Fair Value Measurement at December 31, 2021 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	$	2,122	$	—	$	—
Interest rate swaps	—		424		—
	$	2,122	$	424	$	—
Liabilities:
Interest rate swaps	$	—	$	5,176	$	—

Fair Value of Debt

As of June 30, 2022, the fair value of our fixed rate debt, including our FAME Bonds 2005R-3, FAME Bonds 2015R-1, FAME Bonds 2015R-2, Vermont Bonds 2013, Vermont Bonds 2022A-1, New York Bonds 2014R-1, New York Bonds 2014R-2, New York Bonds 2020 and New Hampshire Bonds (collectively, the "Industrial Revenue Bonds") was approximately $189,558 and the carrying value was $197,000. The fair value of the Industrial Revenue 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, 2022, the carrying value of our Term Loan Facility was $350,000 and the carrying value of our Revolving Credit Facility was $0. 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 the Industrial Revenue 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.

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13.    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, transfer, transportation and disposal, landfill gas-to-energy, processing, and recycling services in the northeastern United States. Our Resource Solutions operating segment leverages our core competencies in materials processing, industrial recycling, organics and resource management service offerings to deliver a comprehensive solution for our larger commercial, municipal, institutional and industrial customers that have more diverse waste and recycling needs. Revenues associated with our Resource Solutions operations are derived from two lines-of-service: processing and non-processing. Revenues from processing services are derived from municipalities and customers in the form of processing fees, tipping fees, commodity sales, and organic material sales. Revenues from non-processing services are derived from brokerage services and overall resource management services providing a wide range of environmental services and resource management solutions to large and complex organizations, as well as traditional collection, disposal and recycling services provided to large account multi-site customers. Legal, tax, information technology, human resources, certain finance and accounting and other administrative functions are included in our Corporate Entities segment, which is not a reportable operating segment. Corporate Entities results reflect those costs not allocated to our reportable operating segments.

Three Months Ended June 30, 2022

Segment	Outside revenues		Inter-company revenues		Depreciation and amortization		Operating income (loss)		Total assets
Eastern	$	87,263	$	22,147	$	11,538	$	6,150	$	362,942
Western	114,884		39,491		15,939		19,897		697,252
Resource Solutions	81,519		317		3,110		6,235		189,820
Corporate entities	—		—		563		(563)		120,705
Eliminations	—		(61,955)		—		—		—
	$	283,666	$	—	$	31,150	$	31,719	$	1,370,719

Three Months Ended June 30, 2021

Segment	Outside revenues		Inter-company revenues		Depreciation and amortization		Operating income (loss)		Total assets
Eastern	$	61,058	$	16,128	$	7,313	$	3,781	$	226,157
Western	98,852		33,566		15,089		14,900		654,314
Resource Solutions	55,965		1,277		1,548		3,651		95,664
Corporate entities	—		—		387		(386)		251,698
Eliminations	—		(50,971)		—		—		—
	$	215,875	$	—	$	24,337	$	21,946	$	1,227,833

Six Months Ended June 30, 2022

Segment	Outside revenues		Inter-company revenues		Depreciation and amortization		Operating income (loss)		Total assets
Eastern	$	158,582	$	38,815	$	22,988	$	3,920	$	362,942
Western	210,723		71,983		30,598		29,160		697,252
Resource Solutions	148,388		1,095		5,872		9,928		189,820
Corporate Entities	—		—		1,121		(1,121)		120,705
Eliminations	—		(111,893)		—		—		—
Total	$	517,693	$	—	$	60,579	$	41,887	$	1,370,719

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Six Months Ended June 30, 2021

Segment	Outside revenues		Inter-company revenues		Depreciation and amortization		Operating income (loss)		Total assets
Eastern	$	113,403	$	28,554	$	13,935	$	6,027	$	226,157
Western	184,616		62,248		29,128		22,657		654,314
Resource Solutions	107,387		3,180		3,116		6,113		95,664
Corporate Entities	—		—		840		(842)		251,698
Eliminations	—		(93,982)		—		—		—
Total	$	405,406	$	—	$	47,019	$	33,955	$	1,227,833

A summary of our revenues attributable to services provided follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
Collection	$	137,261	$	107,327	$	256,793	$	204,796
Disposal	60,204		49,173		103,356		87,026
Power generation	1,753		1,100		4,407		2,403
Processing	2,929		2,310		4,749		3,794
Solid waste operations	202,147		159,910		369,305		298,019
Processing	33,867		21,031		61,263		38,302
Non-processing	47,652		34,934		87,125		69,085
Resource Solutions operations	81,519		55,965		148,388		107,387
Total revenues	$	283,666	$	215,875	$	517,693	$	405,406

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ITEM 2.    MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following discussion should be read in conjunction with our unaudited consolidated financial statements and notes thereto included under Item 1. In addition, reference should be made to our audited consolidated financial statements and notes thereto and related "Management’s Discussion and Analysis of Financial Condition and Results of Operations" appearing in our Annual Report on Form 10-K for the fiscal year ended December 31, 2021 filed with the Securities and Exchange Commission (“SEC”) on February 18, 2022.

This Quarterly Report on Form 10-Q and, in particular, this "Management’s Discussion and Analysis of Financial Condition and Results of Operations", may contain or incorporate a number of forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Exchange Act of 1934, as amended, including statements regarding:

•the projected development of additional disposal capacity or expectations regarding permits for existing capacity;

•the outcome of any legal or regulatory matter;

•expected liquidity and financing plans;

•expected future revenues, operations, expenditures and cash needs;

•fluctuations in commodity pricing of our recyclables, increases in landfill tipping fees and fuel costs and general economic and weather conditions;

•projected future obligations related to final capping, closure and post-closure costs of our existing landfills and any disposal facilities which we may own or operate in the future;

•our ability to use our net operating losses and tax positions;

•our ability to service our debt obligations;

•the recoverability or impairment of any of our assets or goodwill;

•estimates of the potential markets for our products and services, including the anticipated drivers for future growth;

•sales and marketing plans or price and volume assumptions;

•potential business combinations or divestitures; and

•projected improvements to our infrastructure and the impact of such improvements on our business and operations.

In addition, any statements contained in or incorporated by reference into this report that are not statements of historical fact should be considered forward-looking statements. You can identify these forward-looking statements by the use of the words “believes”, “expects”, “anticipates”, “plans”, “may”, “will”, “would”, “intends”, “estimates” and other similar expressions, whether in the negative or affirmative. These forward-looking statements are based on current expectations, estimates, forecasts and projections about the industry and markets in which we operate, as well as management’s beliefs and assumptions, and should be read in conjunction with our consolidated financial statements and notes thereto. These forward-looking statements are not guarantees of future performance, circumstances or events. The occurrence of the events described and the achievement of the expected results depends on many events, some or all of which are not predictable or within our control. Actual results may differ materially from those set forth in the forward-looking statements.

There are a number of important risks and uncertainties that could cause our actual results to differ materially from those indicated by such forward-looking statements. These risks and uncertainties include, without limitation, those detailed in Item 1A, “Risk Factors” in our Annual Report on Form 10-K for the fiscal year ended December 31, 2021 and those included under Part II, Item 1A of this Quarterly Report on Form 10-Q.

There may be additional risks that we are not presently aware of or that we currently believe are immaterial, which could have an adverse impact on our business. We explicitly disclaim any obligation to update any forward-looking statements whether as a result of new information, future events or otherwise, except as otherwise required by law.

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Company Overview

Casella Waste Systems, Inc., a Delaware corporation, and its wholly-owned subsidiaries (collectively, “we”, “us” or “our”), is a regional, vertically integrated solid waste services company. We provide resource management expertise and services to residential, commercial, municipal, institutional and industrial customers, primarily in the areas of solid waste collection and disposal, transfer, recycling and organics services. We provide integrated solid waste services in seven states: Vermont, New Hampshire, New York, Massachusetts, Connecticut, Maine and Pennsylvania, with our headquarters located in Rutland, Vermont. We 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. We manage our resource-renewal operations through the Resource Solutions operating segment, which leverages our core competencies in materials processing, industrial recycling, organics and resource management service offerings to deliver a comprehensive solution for our larger commercial, municipal, institutional and industrial customers that have more diverse waste and recycling needs. Our Resources Solutions operations consist of two lines-of-service: processing and non-processing. Processing services consist of the receipt of recycled, sludge or other organic materials at one of our materials recovery, processing or disposal facilities, where it is then sorted, mixed and/or processed, and then disposed of or sold. Non-processing services consist of brokerage services and overall resource management services, which provide a wide range of environmental services and resource management solutions to large and complex organizations, as well as traditional collection, disposal and recycling services provided to large account multi-site customers.

As of July 15, 2022, we owned and/or operated 50 solid waste collection operations, 65 transfer stations, 25 recycling facilities, eight Subtitle D landfills, three landfill gas-to-energy facilities and one landfill permitted to accept construction and demolition (“C&D”) materials.

Results of Operations

Revenues

We manage our solid waste operations, which include a full range of solid waste services, on a geographic basis through two regional operating segments, which we designate as the Eastern and Western regions. Revenues in our Eastern and Western regions consist primarily of fees charged to customers for solid waste collection and disposal services, including landfill, transfer and transportation, landfill gas-to-energy, and processing services. We derive a substantial portion of our collection revenues from commercial, industrial and municipal services that are generally performed under service agreements or pursuant to contracts with municipalities. The majority of our residential collection services are performed on a subscription basis with individual households. Landfill and transfer customers are charged a tipping fee on a per ton basis for disposing of their solid waste at our disposal facilities and transfer stations. We also generate and sell electricity at certain of our landfill facilities. We manage our resource-renewal operations through the Resource Solutions operating segment, which includes processing and non-processing services. Revenues from processing services are derived from municipalities and customers in the form of processing fees, tipping fees, and commodity sales, primarily comprised of newspaper, corrugated containers, plastics, ferrous and aluminum, and organic materials such as our earthlife® soils products including fertilizers, composts and mulches. Revenues from non-processing services are derived from brokerage services and overall resource management services providing a wide range of environmental services and resource management solutions to large and complex organizations, as well as traditional collection, disposal and recycling services provided to large account multi-site customers.

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A summary of revenues attributable to services provided (dollars in millions and as a percentage of total revenues) follows:

	Three Months Ended June 30,								$ Change		Six Months Ended June 30,								$ Change
	2022				2021						2022				2021
Collection	$	137.3	48.4	%	$	107.3	49.7	%	$	30.0	$	256.8	49.6	%	$	204.8	50.5	%	$	52.0
Disposal	60.2		21.2	%	49.2		22.8	%	11.0		103.4		20.0	%	87.0		21.5	%	16.4
Power	1.8		0.6	%	1.1		0.5	%	0.7		4.4		0.9	%	2.4		0.6	%	2.0
Processing	2.8		1.1	%	2.3		1.1	%	0.5		4.7		0.8	%	3.8		0.9	%	0.9
Solid waste	202.1		71.3	%	159.9		74.1	%	42.2		369.3		71.3	%	298.0		73.5	%	71.3
Processing	33.9		11.9	%	21.1		9.7	%	12.8		61.3		11.9	%	38.3		9.5	%	23.0
Non-processing	47.7		16.8	%	34.9		16.2	%	12.8		87.1		16.8	%	69.1		17.0	%	18.0
Resource solutions	81.6		28.7	%	56.0		25.9	%	25.6		148.4		28.7	%	107.4		26.5	%	41.0
Total revenues	$	283.7	100.0	%	$	215.9	100.0	%	$	67.8	$	517.7	100.0	%	$	405.4	100.0	%	$	112.3

A summary of the period-to-period changes in solid waste revenues (dollars in millions and as percentage growth of solid waste revenues) follows:

	Period-to-Period Change for the Three Months Ended June 30, 2022 vs. 2021				Period-to-Period Change for the Six Months Ended June 30, 2022 vs. 2021
	Amount		% Growth		Amount		% Growth
Price	$	11.1	6.9	%	$	18.9	6.3	%
Volume	2.6		1.6	%	3.3		1.1	%
Surcharges and other fees	8.4		5.3	%	10.2		3.4	%
Commodity price and volume	0.7		0.5	%	2.3		0.8	%
Acquisitions	19.4		12.1	%	36.6		12.3	%
Solid waste revenues	$	42.2	26.4	%	$	71.3	23.9	%

Solid waste revenues

Price. 

The price change component in quarterly solid waste revenues growth from the prior year period is the result of the following:

•$8.3 million from favorable collection pricing; and

•$2.8 million from favorable disposal pricing associated with our landfills, transfer stations and to a lesser extent transportation services in our Western region.

The price change component in year-to-date solid waste revenues growth from the prior year period is the result of the following:

•$14.6 million from favorable collection pricing; and

•$4.3 million from favorable disposal pricing associated with our landfills, transfer stations and to a lesser extent transportation services in our Western region.

Volume.

The volume change component in quarterly solid waste revenues growth from the prior year period is the result of the following:

•$3.1 million from higher disposal volumes (of which $1.4 million relates to higher third-party landfill volumes, $1.2 million relates to higher transfer station volumes and $0.5 million relates to higher transportation volumes); and

•$0.2 million from higher processing volumes; partially offset by

•$(0.7) million from lower collection volumes in our Western region with higher customer churn due to higher pricing, implementation of the energy and environmental fee ("E&E Fee"), and customer deselection.

The volume change component in year-to-date solid waste revenues growth from the prior year period is the result of the following:

•$3.4 million from higher disposal volumes (of which $1.5 million relates to higher transfer station volumes, $1.1 million relates to higher third-party landfill volumes and $0.7 million relates to higher transportation volumes); and

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•$0.1 million from higher processing volumes; partially offset by

•$(0.2) million from lower collection volumes in our Western region with higher customer churn due to higher pricing, implementation of the E&E Fee, and customer deselection.

Surcharges and other fees.

The surcharges and other fees change components in quarterly and year-to-date solid waste revenues growth from the prior year periods are the result of higher energy fee revenues on higher diesel fuel prices, partially offset by lower sustainability recycling adjustment fees ("SRA Fee") year-to-date on higher recycled commodity prices.

Commodity price and volume.

The commodity price and volume change component in quarterly solid waste revenues growth from the prior year period is the result of $0.6 million primarily from favorable energy pricing and $0.1 million from higher landfill gas-to-energy volumes.

The commodity price and volume change component in year-to-date solid waste revenues growth from the prior year period is the result of $1.9 million primarily from favorable energy pricing and $0.4 million from higher landfill gas-to-energy and commodity processing volumes.

Acquisitions.

The acquisitions change components in quarterly and year-to-date solid waste revenues growth from the prior year periods are the result of increased acquisition activity in line with our growth strategy, including the timing and acquisition of eight businesses in the six months ended June 30, 2022 and ten businesses in the fiscal year ended December 31, 2021.

Resource Solutions revenues

The change component in quarterly Resource Solutions revenues growth of $25.6 million from the prior year period is the result of the following:

•$17.2 million from acquisition activity;

•$5.9 million from higher non-processing revenues due to higher volumes on organic business growth, favorable pricing and increased fees; and

•$3.1 million from the favorable impact of recycling commodity pricing on processing revenues; partially offset by

•$(0.6) million from lower processing volumes mainly driven by lower recycling commodity volumes.

The change component in year-to-date Resource Solutions revenues growth of $41.0 million from the prior year period is the result of the following:

•$26.5 million from acquisition activity;

•$9.3 million from higher non-processing revenues due to higher volumes on organic business growth, favorable pricing and increased fees; and

•$5.4 million from the favorable impact of recycling commodity pricing on processing revenues; partially offset by

•$(0.2) million from lower processing volumes mainly driven by lower recycling commodity volumes.

Operating Expenses

A summary of cost of operations, general and administration expense, and depreciation and amortization expense (dollars in millions and as a percentage of total revenues) is as follows:

	Three Months Ended June 30,								$ Change		Six Months Ended June 30,								$ Change
	2022				2021						2022				2021
Cost of operations	$	186.0	65.6	%	$	138.6	64.2	%	$	47.4	$	348.5	67.3	%	$	265.7	65.5	%	$	82.8
General and administration	$	33.6	11.8	%	$	29.2	13.5	%	$	4.4	$	63.4	12.2	%	$	56.3	13.9	%	$	7.1
Depreciation and amortization	$	31.2	11.0	%	$	24.3	11.3	%	$	6.9	$	60.6	11.7	%	$	47.0	11.6	%	$	13.6

Cost of Operations

Cost of operations includes labor costs, tipping fees paid to third-party disposal facilities, fuel costs, maintenance and repair costs of vehicles and equipment, workers’ compensation and vehicle insurance costs, the cost of purchasing materials to be recycled, third-party transportation costs, district and state taxes, host community fees and royalties. Cost of operations also includes accretion expense related to final capping, closure and post-closure obligations, leachate treatment and disposal costs and depletion of landfill operating lease obligations.

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As a percentage of revenues, cost of operations increased approximately 140 basis points and 180 basis points during the three and six months ended June 30, 2022, respectively, from the same periods of the prior year. The period-to-period changes in cost of operations can be primarily attributed to the following:

Third-party direct costs increased $19.6 million quarterly, while increasing approximately 90 basis points as a percentage of revenues, and increased $32.3 million year-to-date, while increasing approximately 80 basis points as a percentage of revenues, due to the following:

•higher hauling and third-party transportation costs associated primarily with:

◦increased solid waste volumes on acquisition activity;

◦higher fuel surcharges from third-party transporters; and

◦higher non-processing volumes in our Resource Solutions operating segment; partially offset by

◦lower Western region collection volumes in the quarter.

•higher purchased material costs associated primarily with:

◦acquisition activity; and

◦higher recycling commodity prices in our Resource Solutions operating segment.

•higher third-party disposal costs associated primarily with:

◦increased solid waste volumes on acquisition activity and to a lesser extent organic business growth; and

◦higher fuel surcharges from third-party transporters.

Direct labor costs increased $8.8 million quarterly, while increasing approximately 10 basis points as a percentage of revenues, and increased $17.3 million year-to-date, while increasing approximately 50 basis points as a percentage of revenues, due primarily to the following:

•wage inflation in our markets and increased overtime and outside labor costs on higher solid waste volumes on acquisition activity and to a lesser extent organic business growth;

•higher non-processing volumes on acquisition activity and organic business growth; and

•higher workers compensation costs on claim activity.

Maintenance and repair costs increased $8.2 million quarterly, while decreasing approximately (60) basis points as a percentage of revenues, and increased $15.5 million year-to-date, while decreasing approximately (30) basis points as a percentage of revenues, due primarily to higher fleet, facility and container maintenance costs associated with inflation and acquisition activity.

Fuel costs increased $7.4 million quarterly, while increasing approximately 200 basis points as a percentage of revenues, and increased $11.8 million year-to-date, while increasing approximately 170 basis points as a percentage of revenues, due primarily to higher fuel prices and higher volumes driven by acquisition activity and to a lesser extent organic business growth.

Direct operational costs increased $3.4 million quarterly, while decreasing approximately (100) basis points as a percentage of revenues, and increased $5.9 million year-to-date, while decreasing approximately (90) basis points as a percentage of revenues, due primarily to the following:

•lower host community and royalty fees; and

•lower non-landfill operating lease expense; more than offset by

•higher landfill operating costs in our Western region due to severe winter weather earlier in the year and construction delays compounded with higher quarterly landfill volumes;

•higher vehicle insurance costs; and

•higher repair and replacement part costs.

General and Administration

General and administration expense includes (i) management, clerical and administrative compensation, (ii) bad debt expense, and (iii) overhead costs, professional service fees and costs associated with marketing, sales force and community relations efforts.

The period-to-period changes in general and administration expenses of $4.4 million quarterly and $7.1 million year-to-date due primarily to increased overhead costs associated with wage inflation, organic business growth, acquisition activity, higher accrued incentive compensation on improved performance, and higher bad debt expense, partially offset by lower equity compensation costs.

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Depreciation and Amortization

Depreciation and amortization expense includes: (i) depreciation of property and equipment (including assets recorded for finance leases) on a straight-line basis over the estimated useful lives of the assets; (ii) amortization of landfill costs (including those costs incurred and all estimated future costs for landfill development and construction, along with asset retirement costs arising from closure and post-closure obligations) on a units-of-consumption method as landfill airspace is consumed over the total estimated remaining capacity of a site, which includes both permitted capacity and unpermitted expansion capacity that meets certain criteria for amortization purposes, and amortization of landfill asset retirement costs arising from final capping obligations on a units-of-consumption method as airspace is consumed over the estimated capacity associated with each final capping event; and (iii) amortization of intangible assets with a definite life, using either an economic benefit provided approach or on a straight-line basis over the definitive terms of the related agreements.

A summary of the components of depreciation and amortization expense (dollars in millions and as a percentage of total revenues) follows:

	Three Months Ended June 30,								$ Change		Six Months Ended June 30,								$ Change
	2022				2021						2022				2021
Depreciation	$	18.9	6.7	%	$	14.5	6.7	%	$	4.4	$	38.4	7.4	%	$	28.8	7.1	%	$	9.6
Landfill amortization	8.0		2.8	%	7.8		3.6	%	0.2		14.1		2.7	%	14.2		3.5	%	(0.1)
Other amortization	4.3		1.5	%	2.0		1.0	%	2.3		8.1		1.6	%	4.0		1.0	%	4.1
	$	31.2	11.0	%	$	24.3	11.3	%	$	6.9	$	60.6	11.7	%	$	47.0	11.6	%	$	13.6

The period-to-period increases in depreciation and other amortization expense can be primarily attributed to acquisition activity, which included $1.5 million of additional depreciation and other amortization expense related to a purchase price allocation adjustment in the quarter ended March 31, 2022, and increased investments in our fleet. Landfill amortization expense increased in the three months ended June 30, 2022, remaining slightly down year-to-date, on higher landfill volumes in our Western region.

Expense from Acquisition Activities

In the three and six months ended June 30, 2022, we recorded charges of $1.0 million and $3.1 million, respectively, and in the three and six months ended June 30, 2021, we recorded charges of $1.6 million and $2.0 million, respectively, comprised primarily of legal, consulting and other similar costs associated with due diligence and the acquisition and integration of acquired businesses or select development projects.

Other Expenses

Interest Expense, net

Our interest expense, net increased $0.4 million quarterly and $0.2 million year-to-date due primarily to rising interest rates and higher average debt balances associated with the issuance of $35.0 million aggregate principal amount of Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2022A-1 ("Vermont Bonds 2022A-1").

Provision for Income Taxes

Our provision for income taxes increased $3.1 million quarterly and $1.7 million year-to-date as compared to the same periods in the prior year, primarily due to higher income from operations between the periods, and one-time adjustments for the tax benefit on equity compensation awards between the periods and for a decrease in the current period in our state deferred tax asset from a change in state law in our footprint. The provision for income taxes in the six months ended June 30, 2022 included $2.4 million of current income taxes and $7.1 million of deferred income taxes. For the six months ended June 30, 2021, the provision included a $0.8 million of current income taxes and $7.1 million of deferred income taxes. The effective rate for the six months ended June 30, 2022 was 31% before the one-time adjustments, and was computed based on the statutory rate of 21% adjusted primarily for state taxes and nondeductible officer compensation.

On December 22, 2017, the Tax Cuts and Jobs Act (the “TCJ Act”) was enacted. The TCJ Act significantly changed U.S. corporate income tax laws by, among other things, changing carryforward rules for net operating losses. Our $52.4 million in federal net operating loss carryforwards generated as of the end of 2017 continue to be carried forward for 20 years and are expected to be available to fully offset taxable income earned in the fiscal year ending December 31, 2022 ("fiscal year 2022") and future tax years. Federal net operating losses generated after 2017, totaling $46.5 million carried forward to fiscal year 2022, will be carried forward indefinitely, but generally may only offset up to 80% of taxable income earned in a tax year.

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Segment Reporting

Revenues

A summary of revenues by operating segment (in millions) follows:

	Three Months Ended June 30,				$ Change		Six Months Ended June 30,				$ Change
	2022		2021				2022		2021
Eastern	$	87.3	$	61.1	$	26.2	$	158.6	$	113.4	$	45.2
Western	114.9		98.9		16.0		210.7		184.6		26.1
Resource solutions	81.5		55.9		25.6		148.4		107.4		41.0
Total revenues	$	283.7	$	215.9	$	67.8	$	517.7	$	405.4	$	112.3

Eastern Region

A summary of the period-to-period changes in solid waste revenues (dollars in millions and as percentage growth of solid waste revenues) follows:

	Period-to-Period Change for the Three Months Ended June 30, 2022 vs. 2021				Period-to-Period Change for the Six Months Ended June 30, 2022 vs. 2021
	Amount		% Growth		Amount		% Growth
Price	$	4.8	7.9	%	$	8.3	7.3	%
Volume	2.2		3.6	%	2.8		2.5	%
Surcharges and other fees	3.7		6.1	%	4.4		3.8	%
Acquisitions	15.5		25.3	%	29.7		26.2	%
Solid waste revenues	$	26.2	42.9	%	$	45.2	39.8	%

Price.

The price change component in quarterly solid waste revenues growth from the prior year period is the result of the following:

•$3.5 million from favorable collection pricing; and

•$1.3 million from favorable disposal pricing related to transfer stations and to a lesser extent landfills.

The price change component in year-to-date solid waste revenues growth from the prior year period is the result of the following:

•$6.3 million from favorable collection pricing; and

•$2.0 million from favorable disposal pricing related to transfer stations and to a lesser extent landfills.

Volume.

The volume change component in quarterly solid waste revenues growth from the prior year period is the result of the following:

•$1.1 million from higher disposal volumes related to transfer stations and to a lesser extent landfills;

•$0.8 million from higher collection volumes as a result of organic business growth; and

•$0.2 million from higher processing volumes.

The volume change component in year-to-date solid waste revenues growth from the prior year period is the result of the following:

•$1.3 million from higher disposal volumes related to transfer stations, partially offset by lower landfill volumes;

•$1.4 million from higher collection volumes as a result of organic business growth; and

•$0.1 million from higher processing volumes.

Surcharges and other fees.

The surcharges and other fees change components in quarterly and year-to-date solid waste revenues growth from the prior year periods are the result of higher energy fee revenues on higher diesel fuel prices, partially offset by lower SRA Fees on higher recycled commodity prices.

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Acquisitions.

The acquisitions change components in quarterly and year-to-date solid waste revenues growth from the prior year periods are the result of increased acquisition activity in line with our growth strategy, including the timing and acquisition of two businesses in the six months ended June 30, 2022 and five businesses in the fiscal year ended December 31, 2021.

Western Region

A summary of the period-to-period changes in solid waste revenues (dollars in millions and as percentage growth of solid waste revenues) follows:

	Period-to-Period Change for the Three Months Ended June 30, 2022 vs. 2021				Period-to-Period Change for the Six Months Ended June 30, 2022 vs. 2021
	Amount		% Growth		Amount		% Growth
Price	$	6.3	6.4	%	$	10.6	5.7	%
Volume	0.4		0.3	%	0.4		0.2	%
Surcharges and other fees	4.7		4.8	%	5.9		3.2	%
Commodity price and volume	0.7		0.7	%	2.3		1.2	%
Acquisitions	3.9		4.0	%	6.9		3.8	%
Solid waste revenues	$	16.0	16.2	%	$	26.1	14.1	%

Price.

The price change component in quarterly solid waste revenues growth from the prior year period is the result of the following:

•$4.8 million from favorable collection pricing; and

•$1.5 million from favorable disposal pricing related to landfills, transfer stations, and to a lesser extent transportation services.

The price change component in year-to-date solid waste revenues growth from the prior year period is the result of the following:

•$8.3 million from favorable collection pricing; and

•$2.3 million from favorable disposal pricing related to landfills, transfer stations, and to a lesser extent transportation services.

Volume.

The volume change components in quarterly and year-to-date solid waste revenues growth from the prior year periods are the result of the following:

•$2.0 million from higher disposal volumes related to landfills, transfer stations, and transportation services; partially offset by

•$(1.6) million from lower collection volumes with higher customer churn due to higher pricing, implementation of the E&E Fee, and customer deselection.

Surcharges and other fees.

The surcharges and other fees change components in quarterly and year-to-date solid waste revenues growth from the prior year periods are the result of higher energy fee revenues on higher diesel fuel prices, partially offset by lower SRA Fees year-to-date on higher recycled commodity prices.

Commodity price and volume.

The commodity price and volume change components in quarterly and year-to-date solid waste revenues growth from the prior year periods are primarily the result of favorable landfill gas-to-energy pricing.

Acquisitions.

The acquisitions change components in quarterly and year-to-date solid waste revenues growth from the prior year periods is the result of increased acquisition activity in line with our growth strategy, including the timing and acquisition of five businesses in the six months ended June 30, 2022 and five businesses in the fiscal year ended December 31, 2021.

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Operating Income

A summary of operating income (loss) by operating segment (in millions) follows:

	Three Months Ended June 30,				$ Change		Six Months Ended June 30,				$ Change
	2022		2021				2022		2021
Eastern	$	6.1	$	3.8	$	2.3	$	3.9	$	6.0	$	(2.1)
Western	19.9		14.9		5.0		29.2		22.7		6.5
Resource Solutions	6.2		3.7		2.5		9.9		6.1		3.8
Corporate entities	(0.5)		(0.5)		—		(1.1)		(0.8)		(0.3)
Operating income	$	31.7	$	21.9	$	9.8	$	41.9	$	34.0	$	7.9

Eastern Region

Operating income increased $2.3 million quarterly and decreased $(2.1) million year-to-date from the prior year periods. Excluding the impact of the Southbridge Landfill closure charge and the expense from acquisition activities, our operating performance in the three and six months ended June 30, 2022 was driven by revenue growth, inclusive of inter-company revenues, and the following cost changes.

Cost of operations: Cost of operations increased $24.3 million quarterly and $44.7 million year-to-date from the prior year periods due to the following:

•higher third-party disposal costs and higher hauling and third-party transportation costs associated with increased solid waste volumes on acquisition activity and to a lesser extent organic business growth, and higher fuel surcharges from third-party transporters;

•higher labor and related benefit costs due primarily to wage inflation in our markets and increased overtime on higher solid waste volumes associated primarily with acquisition activity and to a lesser extent organic business growth, higher outside labor costs, and higher workers compensation costs on claim activity;

•higher maintenance and repair costs due primarily to higher fleet, facility and container maintenance costs associated with inflation and acquisition activity;

•higher fuel costs due to higher fuel prices and higher volumes driven by acquisition activity and to a lesser extent an organic business growth; and

•higher direct operational costs due to increased vehicle insurance costs and higher repair and replacement part costs.

General and administration: General and administration expense increased $2.5 million quarterly and $4.2 million year-to-date from the prior year periods primarily due to increased overhead costs associated with wage inflation, organic business growth, acquisition activity, higher accrued incentive compensation on improved performance, and higher bad debt expense, partially offset by lower equity compensation costs.

Depreciation and amortization: Depreciation and amortization expense increased $4.2 million quarterly and $9.0 million year-to-date from the prior year periods due primarily to acquisition activity, which included additional depreciation and other amortization expense related to a purchase price allocation adjustment in the quarter ended March 31, 2022, and increased investment in our fleet.

Western Region

Operating income increased $5.0 million quarterly and $6.5 million year-to-date from the prior year periods. Excluding the impact of the expense from acquisition activities, our improved operating performance in the three and six months ended June 30, 2022 was driven by revenue growth, inclusive of inter-company revenues, more than offsetting the following cost changes.

Cost of operations: Cost of operations increased $15.1 million quarterly and $25.9 million year-to-date from the prior year periods due to:

•higher third-party disposal costs and higher hauling and third-party transportation costs associated with increased solid waste volumes on acquisition activity, partially offset by lower collection volumes in the quarter and higher fuel surcharges from third-party transporters;

•higher labor and related benefit costs due primarily to wage inflation in our markets and increased overtime on higher solid waste volumes associated with acquisition activity and higher workers compensation costs on claim activity;

•higher maintenance and repair costs due primarily to higher fleet and facility maintenance costs associated with inflation and acquisition activity;

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•higher fuel costs due to higher fuel prices and higher volumes driven by acquisition activity; and

•higher direct operational costs due to higher landfill operating costs due to severe winter weather earlier in the year and construction delays compounded with higher quarterly landfill volumes, higher vehicle insurance costs, and higher repair and replacement part costs, partially offset by lower host community and royalty fees.

General and administration: General and administration expense increased $0.4 million quarterly and $0.7 million year-to-date from the prior year periods primarily due to increased overhead costs associated with wage inflation, organic business growth, acquisition activity, higher accrued incentive compensation on improved performance, and higher bad debt expense, partially offset by lower equity compensation costs.

Depreciation and amortization: Depreciation and amortization expense increased $0.8 million quarterly and $1.5 million year-to-date from the prior year periods primarily due to increased investments in our fleet and acquisition activity. Landfill amortization expense increased in the quarter, remaining slightly down year-to-date, on higher landfill volumes.

Resource Solutions

Operating income increased $2.5 million quarterly and $3.8 million year-to-date from the prior year periods. Excluding the impact of the expense from acquisition activities, our improved operating performance in the three and six months ended June 30, 2022 was driven by revenue growth, inclusive of inter-company revenues, more than offsetting the following cost changes.

Cost of operations: Cost of operations increased $19.3 million quarterly and $30.6 million year-to-date from the prior year periods due to:

•higher purchased material costs associated with acquisition activity and higher recycling commodity prices;

•higher hauling and third-party transportation costs associated primarily with higher non-processing volumes and higher fuel surcharges from third-party transporters;

•higher labor and related benefit costs due primarily to wage inflation in our markets and increased overtime and outside labor costs on higher commodity and non-processing volumes associated with acquisition activity and to a lesser extent organic business growth; and

•higher maintenance and repair costs due primarily to higher facility and container maintenance costs and to a lesser extent vehicle maintenance costs, associated with inflation, acquisition activity, and organic business growth.

General and administration: General and administration expense increased $1.5 million quarterly and $1.8 million year-to-date from the prior year periods due to increased overhead costs associated with wage inflation, organic business growth, acquisition activity and higher quarterly bad debt expense, partially offset by lower equity compensation costs.

Depreciation and amortization: Depreciation and amortization expense increased $1.6 million quarterly and $2.8 million year-to-date from the prior year periods due to acquisition activity, which included additional depreciation and other amortization expense related to a purchase price allocation adjustment in the quarter ended March 31, 2022.

Liquidity and Capital Resources

We continually monitor our actual and forecasted cash flows, our liquidity, and our capital requirements in order to properly manage our liquidity needs as we move forward based on the capital intensive nature of our business and our growth acquisition strategy. We have $271.8 million of undrawn capacity from our $300.0 million Revolving Credit Facility as of June 30, 2022 to help meet our short-term and long-term liquidity needs. We expect existing cash, cash equivalents and restricted cash combined with cash flows from operations and financing activities to continue to be sufficient to fund our operating activities and cash commitments for investing and financing activities for at least the next 12 months and thereafter for the foreseeable future. Our known current- and long-term uses of cash include, among other possible demands: (1) capital expenditures and leases, (2) acquisitions, (3) repayments to service debt and other long-term obligations, and (4) payments for final capping, closure and post-closure asset retirement obligations and environmental remediation liabilities.

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A summary of cash and cash equivalents, restricted assets and debt balances, excluding any debt issuance costs (in millions) follows:

	June 30, 2022		December 31, 2021
Cash, cash equivalents and restricted cash:
Cash and cash equivalents	$	39.3	$	33.8
Restricted cash	1.0		—
Total cash, cash equivalents and restricted cash	$	40.3	$	33.8
Restricted assets:
Restricted investment securities - landfill closure	$	1.8	$	2.1
Debt:
Current portion	$	7.6	$	9.9
Non-current portion	586.1		552.7
Total debt	$	593.7	$	562.6

Summary of Cash Flow Activity

A summary of cash flows (in millions) follows:

	Six Months Ended June 30,				$ Change
	2022		2021
Net cash provided by operating activities	$	92.2	$	79.0	$	13.2
Net cash used in investing activities	$	(110.6)	$	(61.1)	$	(49.5)
Net cash provided by (used in) financing activities	$	24.9	$	(5.0)	$	29.9

Cash flows from operating activities.

A summary of operating cash flows (in millions) follows:

	Six Months Ended June 30,
	2022		2021
Net income	$	22.0	$	16.1
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	60.6		47.0
Interest accretion on landfill and environmental remediation liabilities	4.0		4.0
Amortization of debt issuance costs	0.9		1.1
Stock-based compensation	3.2		6.1
Operating lease right-of-use assets expense	6.8		6.4
Gain on sale of property and equipment	(0.3)		(0.1)
Non-cash expense from acquisition activities	0.6		1.0
Deferred income taxes	7.2		7.0
	105.0		88.6
Changes in assets and liabilities, net	(12.8)		(9.6)
Net cash provided by operating activities	$	92.2	$	79.0

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A summary of the most significant items affecting the change in our operating cash flows follows:

Net cash provided by operating activities increased $13.2 million in the six months ended June 30, 2022 as compared to the six months ended June 30, 2021. This was the result of improved operational performance, partially offset by an increase in the unfavorable cash flow impact associated with the changes in our assets and liabilities, net of effects of acquisitions and divestitures. For discussion of our improved operational performance in the six months ended June 30, 2022 as compared to the six months ended June 30, 2021, see "Results of Operations" above. The increase in the unfavorable cash flow impact associated with the changes in our assets and liabilities, net of effects of acquisitions and divestitures, which are affected by both cost changes and the timing of payments, in the six months ended June 30, 2022 as compared to the six months ended June 30, 2021 was primarily due to the following:

•a $(10.0) million unfavorable impact to operating cash flows associated with the change in accounts receivable associated with increased revenues growth; and

•a $(0.7) million unfavorable impact to operating cash flows associated with the change in accounts payable; partially offset by

•a $6.3 million favorable impact to operating cash flows associated with the change in accrued expenses and other liabilities; and

•a $1.1 million favorable impact to operating cash flows associated with the change in prepaid expenses, inventories and other assets.

Cash flows from investing activities.

A summary of investing cash flows (in millions) follows:

	Six Months Ended June 30,
	2022		2021
Acquisitions, net of cash acquired	$	(56.3)	$	(5.5)
Additions to property, plant and equipment	(54.9)		(56.1)
Proceeds from sale of property and equipment	0.6		0.5
Net cash used in investing activities	$	(110.6)	$	(61.1)

A summary of the most significant items affecting the change in our investing cash flows follows:

Acquisitions, net of cash acquired. In the six months ended June 30, 2022, we acquired eight businesses for total consideration of $58.9 million, including $55.1 million in cash, and paid $1.2 million in holdback payments on businesses previously acquired, as compared to the six months ended June 30, 2021 during which we acquired four businesses for total consideration of $4.9 million, including $4.4 million in cash, and paid $1.1 million in holdback payments on businesses previously acquired.

Capital expenditures. Capital expenditures were $(1.2) million lower in the six months ended June 30, 2022 as compared to the six months ended June 30, 2021 primarily due to lower post-acquisition capital spend and the completion of construction and development of phase VI at our Subtitle D landfill in Coventry, Vermont in the fiscal year ended December 31, 2021, partially offset by higher capital spend associated with landfill development and the retrofitting of a single-stream material recovery facility.

Cash flows from financing activities.

A summary of financing cash flows (in millions) follows:

	Six Months Ended June 30,
	2022		2021
Proceeds from long-term borrowings	$	82.2	$	0.5
Principal payments on debt	(55.3)		(5.6)
Payments of debt issuance costs	(1.2)		—
Payments of contingent consideration	(1.0)		—
Proceeds from the exercise of share based awards	0.2		0.1
Net cash provided by (used in) financing activities	$	24.9	$	(5.0)

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A summary of the most significant items affecting the change in our financing cash flows follows:

Debt activity. Net cash associated with debt activity increased $32.0 million. The increase in financing cash flows in the six months ended June 30, 2022 is due primarily to the issuance of $35.0 million aggregate principal amount of Vermont Bonds 2022A-1.

Payment of debt issuance costs. We paid $1.2 million of debt issuance costs in the six months ended June 30, 2022 related to the issuance of of Vermont Bonds 2022A-1.

Payment of contingent consideration. We paid $1.0 million of contingent consideration associated with an acquisition based on the completion of a permit expansion application.

Outstanding Long-Term Debt

Credit Facility

As of June 30, 2022, we had outstanding $350.0 million aggregate principal amount of borrowings under our term loan A facility ("Term Loan Facility") and $0.0 million in borrowings under our $300.0 million revolving credit facility ("Revolving Credit Facility"), with a $75.0 million sublimit for letters of credit (the Term Loan Facility and the Revolving Credit Facility together, the “Credit Facility”). The Credit Facility has a 5-year term that matures in December 2026 and bears interest at a rate of London Inter-Bank Offered Rate ("LIBOR") plus 1.375% per annum, which will be reduced to a rate of LIBOR plus as low as 1.125% upon us reaching a consolidated net leverage ratio of less than 2.25x. The Credit Facility contains customary benchmark replacement provisions pursuant to which, upon certain triggering events, the LIBOR benchmark used to calculate the LIBOR rate will be replaced with a secured overnight financing rate, as adjusted, on the terms and conditions in the amended and restated credit agreement ("Credit Agreement"). 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, 2022, further advances were available under the Revolving Credit Facility in the amount of $271.8 million. The available amount is net of outstanding irrevocable letters of credit totaling $28.2 million, and as of June 30, 2022 no amount had been drawn. 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 $125.0 million, subject to the terms and conditions set forth in the Credit Agreement.

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. 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. As of June 30, 2022, we were in compliance with the covenants contained in the Credit Agreement. 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.

Based on the seasonality of our business, operating results in the late fall, winter and early spring months are generally lower than the remainder of our fiscal year. Given the cash flow impact that this seasonality, the capital intensive nature of our business and the timing of debt payments has on our business, we typically incur higher debt borrowings in order to meet our liquidity needs during these times. Consequently, our availability and performance against our financial covenants may tighten during these times as well.

Tax-Exempt Financings and Other Debt

As of June 30, 2022, we had outstanding $197.0 million aggregate principal amount of tax exempt bonds, including the issuance of $35.0 million aggregate principal amount of Vermont Bonds 2022A-1, $45.9 million aggregate principal amount of finance leases and $0.8 million aggregate principal amount of notes payable. See Note 7, Debt to our consolidated financial statements included in Part I, Item 1 of this Quarterly Report on Form 10-Q for further disclosure over debt.

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Inflation

Inflationary increases in costs, including current inflationary pressures associated primarily with fuel, labor and certain other cost categories and capital items, have materially affected, and may continue to materially affect, our operating margins and cash flows. While rapid inflation negatively impacted operating results and margins during the three and six months ended June 30, 2022, we believe that our flexible pricing structures and mature cost recovery fees are allowing us to recover and will continue to allow us to recover certain inflationary costs from our customer base. Consistent with industry practice, most of our contracts and service agreements provide for a pass-through of certain costs to our customers, including increases in landfill tipping fees and in most cases fuel costs, intended to mitigate the impact of inflation on our operating results. We have also implemented a number of operating efficiency programs that seek to improve productivity and reduce our service costs, and the E&E Fee, which is designed to recover escalating fuel price fluctuations above a periodically reset floor. Despite these programs, competitive factors may require us to absorb at least a portion of these cost increases. Additionally, management’s estimates associated with inflation have had, and will continue to have, an impact on our accounting for landfill and environmental remediation liabilities.

Regional Economic Conditions

Our business is primarily located in the northeastern United States. Therefore, our business, financial condition and results of operations are susceptible to downturns in the general economy in this geographic region and other factors affecting the region, such as state regulations and severe weather conditions. We are unable to forecast or determine the timing and/or the future impact of a sustained economic slowdown.

Seasonality and Severe Weather

Our transfer and disposal revenues historically have been higher in the late spring, summer and early fall months. This seasonality reflects lower volumes of waste in the late fall, winter and early spring months because the volume of waste relating to C&D activities decreases substantially during the winter months in the northeastern United States.

Because certain of our operating and fixed costs remain constant throughout the fiscal year, operating income is therefore impacted by a similar seasonality. Our operations can be adversely affected by periods of inclement or severe weather, which could increase our operating costs associated with the collection and disposal of waste, delay the collection and disposal of waste, reduce the volume of waste delivered to our disposal sites, increase the volume of waste collected under our existing contracts (without corresponding compensation), decrease the throughput and operating efficiency of our materials recycling facilities, or delay construction or expansion of our landfill sites and other facilities. Our operations can also be favorably affected by severe weather, which could increase the volume of waste in situations where we are able to charge for our additional services provided.

Our processing line-of-business in the Resource Solutions operating segment experiences increased volumes of fiber in November and December due to increased retail activity during the holiday season.

Critical Accounting Estimates and Assumptions

Our financial statements have been prepared in accordance with generally accepted accounting principles in the United States and necessarily include certain estimates and judgments made by management. On an on-going basis, management evaluates its estimates and judgments which are based on historical experience and on various other factors that are believed to be reasonable under the circumstances. The results of their evaluation form the basis for making judgments about the carrying values of assets and liabilities. Actual results may differ from these estimates under different assumptions and circumstances. Our critical accounting estimates are more fully discussed in Item 7, "Management's Discussion and Analysis of Financial Condition and Results of Operations" of our Annual Report on Form 10-K for the fiscal year ended December 31, 2021.

New Accounting Pronouncements

For a description of the new accounting standards that may affect us, see Note 2, Accounting Changes to our consolidated financial statements included under Part I, Item 1 of this Quarterly Report on Form 10-Q.

ITEM 3.    QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

In the normal course of business we are exposed to market risks, including changes in interest rates and certain commodity prices. We have a variety of strategies to mitigate these market risks, including at times using derivative instruments to hedge some portion of these risks.

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Interest Rate Volatility

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. 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 income (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.

As of June 30, 2022, our active interest rate derivative agreements had total notional amounts of $190.0 million. According to the terms of the agreements, we receive interest based on the 1-month LIBOR index, in some instances restricted by a 0.0% floor, and pay interest at a weighted average rate of approximately 2.20% as of June 30, 2022. The agreements mature between May 2023 and June 2027. Additionally, as of June 30, 2022, we have a forward starting interest rate derivative agreement with a total notional amount of $20.0 million that matures in May 2028. We will receive interest based on the 1-month LIBOR index, restricted by a 0.0% floor, and will pay interest at a rate of 1.29%.

As of June 30, 2022, we had $243.7 million of fixed rate debt in addition to the $190.0 million fixed through our interest rate derivative agreements. We had interest rate risk relating to approximately $160.0 million of long-term debt as of June 30, 2022. The weighted average interest rate on the variable rate portion of long-term debt was approximately 2.7% at June 30, 2022. Should the average interest rate on the variable rate portion of long-term debt change by 100 basis points, we estimate that our annual interest expense would change by up to approximately $1.6 million.

Commodity Price Volatility

Information about commodity price volatility market risk as of June 30, 2022 does not differ materially from that discussed in Item 7A, "Quantitative and Qualitative Disclosures About Market Risk" of our Annual Report on Form 10-K for the fiscal year ended December 31, 2021.

ITEM 4.    CONTROLS AND PROCEDURES

Evaluation of disclosure controls and procedures. Our management, with the participation of our chief executive officer and chief financial officer, evaluated the effectiveness of our disclosure controls and procedures as of June 30, 2022. The term “disclosure controls and procedures,” as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (“Exchange Act”), means controls and other procedures of a company that are designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported, within the time periods specified in the SEC’s rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is accumulated and communicated to the company’s management, including its principal executive and principal financial officers, as appropriate to allow timely decisions regarding required disclosure. Management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving their objectives and management necessarily applies its judgment in evaluating the cost-benefit relationship of possible controls and procedures. Based on the evaluation of our disclosure controls and procedures as of June 30, 2022, our chief executive officer and chief financial officer concluded that, as of such date, our disclosure controls and procedures were effective at the reasonable assurance level.

Changes in internal controls over financial reporting. No change in our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) occurred during the three months ended June 30, 2022 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

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PART II.

ITEM 1.    LEGAL PROCEEDINGS

General Legal Proceedings

The information required by this Item is provided in Note 8, Commitments and Contingencies to our consolidated financial statements included in Part I, Item 1 of this Quarterly Report on Form 10-Q.

Legal Proceedings over Certain Environmental Matters Involving Governmental Authorities with Possible Sanctions of $1,000,000 or More

Item 103 of the SEC's Regulation S-K requires disclosure of certain environmental matters when a governmental authority is a party to the proceedings and the proceedings involve potential monetary sanctions unless we reasonably believe the monetary sanctions will not equal or exceed a specified threshold which we determine is reasonably designed to result in disclosure of any such proceeding that is material to our business or financial condition. Pursuant to Item 103, we have determined such disclosure threshold to be $1,000,000. We have no matters to disclose in accordance with that requirement.

40

ITEM 1A.    RISK FACTORS

Our business is subject to a number of risks, including those identified in Item 1A, “Risk Factors” of our Annual Report on Form 10-K for the fiscal year ended December 31, 2021, and the updated risk factor set forth below, that could have a material effect on our business, results of operations, financial condition and/or liquidity and that could cause our operating results to vary significantly from period to period. We may disclose additional changes to our risk factors or disclose additional factors from time to time in our future filings with the Securities and Exchange Commission.

The waste industry is subject to extensive government regulations, including environmental laws and regulations, and we incur substantial costs to comply with such laws and regulations. Failure to comply with environmental or other laws and regulations, as well as enforcement actions and litigation arising from an actual or perceived breach of such laws and regulations, could subject us to fines, penalties, and judgments, and impose limits on our ability to operate and expand.

We are subject to potential liability and restrictions under environmental laws and regulations, including potential liability and restrictions arising from or relating to the transportation, handling, recycling, generation, treatment, storage and disposal of wastes, the presence, release, discharge or emission of pollutants, and the investigation, remediation and monitoring of impacts to soil, surface water, groundwater and other environmental media including natural resources, as a result of the actual or alleged presence, release, discharge or emission of hazardous substances, pollutants or contaminants on, at, under or migrating from our properties, or in connection with our operations. The waste management industry has been and will continue to be subject to regulation, including permitting and related financial assurance requirements, as well as attempts to further regulate the industry, including efforts to regulate and limit the emission of greenhouse gases to ameliorate the effect of climate change. Our solid waste operations are subject to a wide range of federal, state and, in some cases, local environmental, odor and noise and land use restrictions. If we are not able to comply with the requirements that apply to a particular facility or if we operate in violation of the terms and conditions of, or without the necessary approvals or permits, we could be subject to administrative or civil, and possibly criminal, fines and penalties, and we may be required to spend substantial capital to bring an operation into compliance, to temporarily or permanently discontinue activities, and/or take corrective actions, possibly including removal of landfilled materials. Those costs or actions could be significant to us and affect our results of operations, cash flows, and available capital. Environmental and land use laws and regulations also affect our ability to expand and, in the case of our solid waste operations, may dictate those geographic areas from which we must, or, from which we may not, accept solid waste. Those laws and regulations may limit the overall size and daily solid waste volume that may be accepted by a solid waste operation. If we are not able to expand or otherwise operate one or more of our facilities because of limits imposed under such laws, we may be required to increase our utilization of disposal facilities owned by third-parties, which could reduce our revenues and/or operating margins.

We have historically grown through acquisitions, may make additional acquisitions in the future, and we have tried and will continue to try to evaluate and limit environmental risks and liabilities presented by businesses to be acquired prior to the acquisition. It is possible that some liabilities may prove to be more difficult or costly to address than we anticipate. It is also possible that government officials responsible for enforcing environmental laws and regulations may believe an issue is more serious than we expect, or that we will fail to identify or fully appreciate an existing liability before we become responsible for addressing it. Some of the legal sanctions to which we could become subject could cause the suspension or revocation of a permit, prevent us from, or delay us in, obtaining or renewing permits to operate or expand our facilities, or harm our reputation.

In addition to the costs of complying with environmental laws and regulations, we incur costs in connection with environmental proceedings and litigation brought against us by government agencies and private parties. We are, and may be in the future, a defendant in lawsuits brought by parties alleging environmental damage, including natural resource damage, personal injury, and/or property damage or impairment, or seeking to impose civil penalties, injunctive relief or overturn or prevent the issuance of an operating permit or authorization, all of which may result in us incurring significant liabilities.

The conduct of our businesses is also subject to various other laws and regulations administered by federal, state and local governmental agencies, including tax laws, employment laws and competition laws, among others. New laws, regulations or governmental policy and their related interpretations, or changes in any of the foregoing, including taxes or other limitations on our services, may alter the environment in which we do business. This includes recent changes in solid waste laws of the State of Maine, which we do not anticipate will have a material effect on our business, results of operations, financial condition and/or liquidity, but may negatively impact our operating results in the form of lower revenues or increased costs and/or liabilities.

In certain jurisdictions, we are subject to compliance with specific obligations under competition laws due to our competitive position in those jurisdictions. Failure to comply with these requirements or other laws or regulations could subject us to enforcement actions or financial penalties which could have a material adverse effect on our business.

41

ITEM 6.    EXHIBITS

Exhibit No.	Description
4.1	Loan Agreement, dated as of June 1, 2022, between Vermont Economic Development Authority and Casella Waste Systems, Inc. (incorporated herein by reference to Exhibit 4.1 to the Current Report on Form 8-K of Casella as filed on June 1, 2022 (file no. 000-23211)).
4.2	Guaranty Agreement, dated as of June 1, 2022, by and between the guarantors named therein and US. Bank Trust Company, National Association, as trustee (incorporated herein by reference to Exhibit 4.2 to the Current Report on Form 8-K of Casella as filed on June 1, 2022 (file no. 000-23211)).
10.1	Employment Agreement between Casella Waste Systems, Inc. and Kevin Drohan effective as of April 1, 2022 (incorporated herein by reference to Exhibit 10.1 to the Current Report on Form 8-K of Casella as filed on March 31, 2022 (file no. 000-23211)).
10.2	Amended and Restated Employment Agreement between Casella Waste Systems, Inc. and Edwin D. Johnson dated as of June 20, 2022 (incorporated herein by reference to Exhibit 10.1 to the Current Report on Form 8-K of Casella as filed on June 22, 2022 (file no. 000-23211)).
10.3	Amended and Restated Employment Agreement between Casella Waste Systems, Inc. and Edmond R. Coletta dated as of June 20, 2022 (incorporated herein by reference to Exhibit 10.1 to the Current Report on Form 8-K/A of Casella as filed on June 22, 2022 (file no. 000-23211)).
10.4	Employment Agreement between Casella Waste Systems, Inc. and Sean Steves effective as of July 1, 2022 (incorporated herein by reference to Exhibit 10.2 to the Current Report on Form 8-K/A of Casella as filed on June 22, 2022 (file no. 000-23211)).
10.5 +	Amendment to Amended and Restated Employment Agreement between Casella Waste Systems, Inc. and Edwin D. Johnson dated as of July 21, 2022.
31.1 +	Certification of John W. Casella, Principal Executive Officer, pursuant to Section 302 of the Sarbanes – Oxley Act of 2002.
31.2 +	Certification of Edmond R. Coletta, Principal Financial Officer, pursuant to Section 302 of the Sarbanes – Oxley Act of 2002.
32.1 ++	Certification of Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes- Oxley Act of 2002.
32.2 ++	Certification of Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes- Oxley Act of 2002.
101.INS	The instance document does not appear in the interactive data file because its XBRL tags are embedded within the inline XBRL document.
101.SCH	Inline XBRL Taxonomy Extension Schema Document.**
101.CAL	Inline XBRL Taxonomy Calculation Linkbase Document.**
101.LAB	Inline XBRL Taxonomy Label Linkbase Document.**
101.PRE	Inline XBRL Taxonomy Presentation Linkbase Document.**
101.DEF	Inline XBRL Taxonomy Extension Definition Linkbase Document.**
104	Cover Page Interactive Data File (formatted as inline XBRL with applicable taxonomy extension information contained in Exhibits 101.)

**	Submitted Electronically Herewith. Attached as Exhibit 101 to this report are the following formatted in inline XBRL (Extensible Business Reporting Language): (i) Consolidated Balance Sheets as of June 30, 2022 and December 31, 2021, (ii) Consolidated Statements of Operations for the three and six months ended June 30, 2022 and 2021, (iii) Consolidated Statements of Comprehensive Income for the three and six months ended June 30, 2022 and 2021, (iv) Consolidated Statements of Stockholders’ Equity for the three and six months ended June 30, 2022 and 2021, (v) Consolidated Statements of Cash Flows for the six months ended June 30, 2022 and 2021, and (vi) Notes to Consolidated Financial Statements.
+	Filed Herewith
++	Furnished Herewith

42

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	Casella Waste Systems, Inc.
Date: July 29, 2022	By: /s/ Kevin Drohan
	Kevin Drohan
	Vice President and Chief Accounting Officer
	(Principal Accounting Officer)
Date: July 29, 2022	By: /s/ Edmond R. Coletta
	Edmond R. Coletta
	President and Chief Financial Officer
	(Principal Financial Officer)

43

EX-10.5

Exhibit 10.5

AMENDMENT TO AMENDED AND RESTATED EMPLOYMENT AGREEMENT

This amendment to the Amended and Restated Employment Agreement (“Amendment”) made as of this 21st day of July, 2022, is by and between Casella Waste Systems, Inc., a Delaware corporation with an address of 25 Greens Hill Lane, Rutland, VT 05701 (“Casella”) and Edwin Johnson, an individual and a resident of Center Rutland, Vermont (“Johnson”).

WHEREAS, Casella and Johnson are parties to that certain Amended and Restated Employment Agreement (“Agreement”) dated as of June 20, 2022; and

WHEREAS, the Agreement remains in full force and effect, however, Casella and Johnson wish to clarify a certain term of the Agreement.

NOW THEREFORE, in consideration of the foregoing premises, and the mutual conditions and covenants contained herein, the parties hereto, intending to be legally bound, do hereby agree as follows:

1.Section 3.7 of the Agreement, Equity Awards, shall be deleted in its entirety and replaced with the following:

Equity Awards. Employee shall no longer be eligible to receive equity awards, and any outstanding equity awards shall be terminated as of June 30, 2022.

All other terms and conditions in the Agreement remain in effect.

IN WITNESS WHEREOF, the parties have executed this Amendment to the Agreement effective the day and year first above written.

	CASELLA WASTE SYSTEMS, INC.		EDWIN JOHNSON
By:	/s/ Jason Mead	By:	/s/ Edwin Johnson
Name:	Jason Mead	Name:	Edwin D. Johnson
Title:	SVP and Treasurer	Title:	Senior Operations Advisor

2

EX-31.1

EXHIBIT 31.1

CERTIFICATION

I, John W. Casella, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of Casella Waste Systems, Inc.;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: July 29, 2022	By: /s/ John W. Casella
	John W. Casella
	Chairman and Chief Executive Officer
	(Principal Executive Officer)

EX-31.2

EXHIBIT 31.2

CERTIFICATION

I, Edmond R. Coletta, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of Casella Waste Systems, Inc.;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a)Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b)Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c)Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d)Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a)All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b)Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: July 29, 2022	By: /s/ Edmond R. Coletta
	Edmond R. Coletta
	President and Chief Financial Officer
	(Principal Financial Officer)

EX-32.1

EXHIBIT 32.1

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of Casella Waste Systems, Inc. for the period ended June 30, 2022 as filed with the Securities and Exchange Commission on the date hereof (“Report”), the undersigned, John W. Casella, Chairman and Chief Executive Officer, hereby certifies, pursuant to 18 U.S.C. Section 1350, that, to his knowledge:

(1)the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)the information contained in the Report fairly presents, in all material respects, our financial condition and results of operations.

Date: July 29, 2022	By: /s/ John W. Casella
	Chairman and Chief Executive Officer
	(Principal Executive Officer)

EX-32.2

EXHIBIT 32.2

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of Casella Waste Systems, Inc. for the period ended June 30, 2022 as filed with the Securities and Exchange Commission on the date hereof (“Report”), the undersigned, Edmond R. Coletta, Senior Vice President and Chief Financial Officer, hereby certifies, pursuant to 18 U.S.C. Section 1350, that, to his knowledge:

(1)the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)the information contained in the Report fairly presents, in all material respects, our financial condition and results of operations.

Date: July 29, 2022	By: /s/ Edmond R. Coletta
	President and Chief Financial Officer
	(Principal Financial Officer)

XML

COVER - shares	6 Months Ended
	Jun. 30, 2022	Jul. 15, 2022
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2022
Document Transition Report	false
Entity File Number	000-23211
Entity Registrant Name	CASELLA WASTE SYSTEMS, INC.
Entity Incorporation, State or Country Code	DE
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
Title of 12(b) Security	Class A common stock, $0.01 par value per share
Trading Symbol	CWST
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Central Index Key	0000911177
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q2
Amendment Flag	false
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		50,689,841
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		988,200

XML

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
CURRENT ASSETS:
Cash and cash equivalents	$ 39,309	$ 33,809
Accounts receivable, net of allowance for credit losses of $3,879 and $3,276, respectively	108,313	86,979
Prepaid expenses	17,517	12,766
Inventory	13,071	9,729
Other current assets	2,946	3,196
Total current assets	181,156	146,479
Property, plant and equipment, net of accumulated depreciation and amortization of $1,016,382 and $973,094, respectively	668,381	644,604
Operating lease right-of-use assets	93,253	93,799
Goodwill	262,508	232,860
Intangible assets, net	96,762	93,723
Restricted cash and assets	2,805	2,122
Cost method investments	11,264	11,264
Deferred income taxes	34,060	43,957
Other non-current assets	20,530	14,772
Total assets	1,370,719	1,283,580
CURRENT LIABILITIES:
Current maturities of debt	7,636	9,901
Current operating lease liabilities	6,425	7,307
Accounts payable	73,270	63,086
Accrued payroll and related expenses	16,392	22,210
Accrued interest	2,372	2,042
Contract liabilities	3,733	3,404
Current accrued capping, closure and post-closure costs	5,815	7,915
Other accrued liabilities	47,371	36,328
Total current liabilities	163,014	152,193
Debt, less current portion	575,556	542,503
Operating lease liabilities, less current portion	59,027	56,375
Accrued capping, closure and post-closure costs, less current portion	86,558	78,999
Deferred income taxes	902	868
Other long-term liabilities	28,096	30,185
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' EQUITY:
Additional paid-in capital	656,042	652,045
Accumulated deficit	(203,013)	(224,999)
Accumulated other comprehensive income (loss), net of tax	4,020	(5,103)
Total stockholders' equity	457,566	422,457
Total liabilities and stockholders' equity	1,370,719	1,283,580
Class A Common Stock
STOCKHOLDERS' EQUITY:
Common stock	507	504
Class B Common Stock
STOCKHOLDERS' EQUITY:
Common stock	$ 10	$ 10

XML

CONSOLIDATED BALANCE SHEETS (Parenthetical) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2022 USD ($) vote $ / shares shares	Dec. 31, 2021 USD ($) vote $ / shares shares
Accounts receivable - trade, allowance for credit losses | $	$ 3,879	$ 3,276
Accumulated depreciation and amortization | $	$ 1,016,382	$ 973,094
Class A Common Stock
Common stock, par value (in dollars per share) | $ / shares	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	50,690,000	50,423,000
Common stock, shares outstanding (in shares)	50,690,000	50,423,000
Class B Common Stock
Common stock, par value (in dollars per share) | $ / shares	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	1,000,000	1,000,000
Common stock, shares issued (in shares)	988,000	988,000
Common stock, shares outstanding (in shares)	988,000	988,000
Votes per share held (in votes) | vote	10	10

XML

UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Revenues	$ 283,666	$ 215,875	$ 517,693	$ 405,406
Operating expenses:
Cost of operations	186,038	138,553	348,493	265,691
General and administration	33,562	29,212	63,354	56,343
Depreciation and amortization	31,150	24,337	60,579	47,019
Expense from acquisition activities	1,019	1,632	3,062	2,046
Southbridge Landfill closure charge	178	195	318	352
Total operating expenses	251,947	193,929	475,806	371,451
Operating income	31,719	21,946	41,887	33,955
Other expense (income):
Interest income	(42)	(66)	(81)	(130)
Interest expense	5,698	5,296	10,902	10,764
Other income	(312)	(510)	(457)	(648)
Other expense, net	5,344	4,720	10,364	9,986
Income before income taxes	26,375	17,226	31,523	23,969
Provision for income taxes	8,579	5,443	9,537	7,875
Net income	$ 17,796	$ 11,783	$ 21,986	$ 16,094
Basic earnings per share attributable to common stockholders:
Weighted average common shares outstanding, basic (in shares)	51,642	51,366	51,567	51,273
Basic earnings per common share (in dollars per share)	$ 0.34	$ 0.23	$ 0.43	$ 0.31
Diluted earnings per share attributable to common stockholders:
Weighted average common shares outstanding, diluted (in shares)	51,781	51,546	51,720	51,466
Diluted earnings per common share (in dollars per share)	$ 0.34	$ 0.23	$ 0.43	$ 0.31

XML

UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 17,796	$ 11,783	$ 21,986	$ 16,094
Hedging activity:
Interest rate swap settlements	(932)	(1,186)	(2,095)	(2,346)
Interest rate swap amounts reclassified into interest expense	994	1,202	2,122	2,347
Unrealized gain (loss) resulting from changes in fair value of derivative instruments	3,488	(336)	11,869	4,651
Other comprehensive income (loss), before tax	3,550	(320)	11,896	4,652
Income tax provision (benefit) related to items of other comprehensive income	570	(85)	2,773	1,057
Other comprehensive income (loss), net of tax	2,980	(235)	9,123	3,595
Comprehensive income	$ 20,776	$ 11,548	$ 31,109	$ 19,689

XML

UNAUDITED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Additional Paid-In Capital	Accumulated Deficit	Accumulated other comprehensive income (loss), net of tax	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, 2020	$ 362,142	$ 639,247	$ (266,099)	$ (11,517)		$ 501		$ 10
Beginning balance (in shares) at Dec. 31, 2020						50,101,000		988,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuances of Class A common stock	112	109				$ 3
Issuance of Class A common stock (in shares)						273,000
Stock-based compensation	2,941	2,941
Net income (loss)	4,311		4,311
Hedging activity	3,830			3,830
Ending balance at Mar. 31, 2021	373,336	642,297	(261,788)	(7,687)		$ 504		$ 10
Ending balance (in shares) at Mar. 31, 2021						50,374,000		988,000
Beginning balance at Dec. 31, 2020	362,142	639,247	(266,099)	(11,517)		$ 501		$ 10
Beginning balance (in shares) at Dec. 31, 2020						50,101,000		988,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	16,094
Hedging activity	3,595
Ending balance at Jun. 30, 2021	388,492	645,905	(250,005)	(7,922)		$ 504		$ 10
Ending balance (in shares) at Jun. 30, 2021					50,398,000	50,398,000	988,000	988,000
Beginning balance at Mar. 31, 2021	373,336	642,297	(261,788)	(7,687)		$ 504		$ 10
Beginning balance (in shares) at Mar. 31, 2021						50,374,000		988,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuances of Class A common stock	492	492
Issuance of Class A common stock (in shares)						24,000
Stock-based compensation	3,116	3,116
Net income (loss)	11,783		11,783
Hedging activity	(235)			(235)
Ending balance at Jun. 30, 2021	388,492	645,905	(250,005)	(7,922)		$ 504		$ 10
Ending balance (in shares) at Jun. 30, 2021					50,398,000	50,398,000	988,000	988,000
Beginning balance at Dec. 31, 2021	422,457	652,045	(224,999)	(5,103)		$ 504		$ 10
Beginning balance (in shares) at Dec. 31, 2021					50,423,000	50,423,000	988,000	988,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuances of Class A common stock	19	17				$ 2
Issuance of Class A common stock (in shares)						227,000
Stock-based compensation	2,241	2,241
Net income (loss)	4,190		4,190
Hedging activity	6,143			6,143
Ending balance at Mar. 31, 2022	435,050	654,303	(220,809)	1,040		$ 506		$ 10
Ending balance (in shares) at Mar. 31, 2022						50,650,000		988,000
Beginning balance at Dec. 31, 2021	422,457	652,045	(224,999)	(5,103)		$ 504		$ 10
Beginning balance (in shares) at Dec. 31, 2021					50,423,000	50,423,000	988,000	988,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	21,986
Hedging activity	9,123
Ending balance at Jun. 30, 2022	457,566	656,042	(203,013)	4,020		$ 507		$ 10
Ending balance (in shares) at Jun. 30, 2022					50,690,000	50,690,000	988,000	988,000
Beginning balance at Mar. 31, 2022	435,050	654,303	(220,809)	1,040		$ 506		$ 10
Beginning balance (in shares) at Mar. 31, 2022						50,650,000		988,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuances of Class A common stock	803	802				$ 1
Issuance of Class A common stock (in shares)						40,000
Stock-based compensation	937	937
Net income (loss)	17,796		17,796
Hedging activity	2,980			2,980
Ending balance at Jun. 30, 2022	$ 457,566	$ 656,042	$ (203,013)	$ 4,020		$ 507		$ 10
Ending balance (in shares) at Jun. 30, 2022					50,690,000	50,690,000	988,000	988,000

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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash Flows from Operating Activities:
Net income	$ 21,986	$ 16,094
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	60,579	47,019
Interest accretion on landfill and environmental remediation liabilities	4,015	3,962
Amortization of debt issuance costs	924	1,144
Stock-based compensation	3,178	6,057
Operating lease right-of-use assets expense	6,824	6,407
Gain on sale of property and equipment	(269)	(92)
Non-cash expense from acquisition activities	645	1,022
Deferred income taxes	7,156	7,041
Changes in assets and liabilities, net of effects of acquisitions and divestitures:
Accounts receivable	(14,667)	(4,712)
Landfill operating lease contract expenditures	(1,308)	(1,478)
Accounts payable	10,142	10,866
Prepaid expenses, inventories and other assets	(6,099)	(7,192)
Accrued expenses, contract liabilities and other liabilities	(855)	(7,125)
Net cash provided by operating activities	92,251	79,013
Cash Flows from Investing Activities:
Acquisitions, net of cash acquired	(56,250)	(5,481)
Additions to property, plant and equipment	(54,868)	(56,069)
Proceeds from sale of property and equipment	507	403
Net cash used in investing activities	(110,611)	(61,147)
Cash Flows from Financing Activities:
Proceeds from debt borrowings	82,200	500
Principal payments on debt	(55,297)	(5,643)
Payments of debt issuance costs	(1,229)	0
Payments of contingent consideration	(1,000)	0
Proceeds from the exercise of share based awards	192	112
Net cash provided by (used in) financing activities	24,866	(5,031)
Net increase in cash and cash equivalents	6,506	12,835
Cash, cash equivalents and restricted cash, beginning of period	33,809	154,342
Cash, cash equivalents and restricted cash, end of period	40,315	167,177
Supplemental Disclosure of Cash Flow Information:
Cash interest payments	9,648	9,701
Cash income tax payments	2,092	411
Non-current assets obtained through long-term financing obligations	4,190	5,894
Right-of-use assets obtained in exchange for operating lease obligations	$ 5,194	$ 1,251

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BASIS OF PRESENTATION

6 Months Ended

Jun. 30, 2022

Organization, Consolidation and Presentation of Financial Statements [Abstract]

BASIS OF PRESENTATION

BASIS OF PRESENTATION

Casella Waste Systems, Inc. (“Parent”), and its subsidiaries (collectively, “we”, “us” or “our”), is a regional, vertically integrated solid waste services company. We provide resource management expertise and services to residential, commercial, municipal, institutional and industrial customers, primarily in the areas of solid waste collection and disposal, transfer, recycling and organics services. We provide integrated solid waste services in seven states: Vermont, New Hampshire, New York, Massachusetts, Connecticut, Maine and Pennsylvania, with our headquarters located in Rutland, Vermont. We 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. We manage our resource-renewal operations through the Resource Solutions operating segment, which leverages our core competencies in materials processing, industrial recycling, organics and resource management service offerings to deliver a comprehensive solution for our larger commercial, municipal, institutional and industrial customers that have more diverse waste and recycling needs. Legal, tax, information technology, human resources, certain finance and accounting and other administrative functions are included in our Corporate Entities segment.

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, "Financial Statements and Supplementary Data" of our Annual Report on Form 10-K for the fiscal year ended December 31, 2021 ("fiscal year 2021"), which was filed with the SEC on February 18, 2022.

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, 2022 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 fiscal year 2021.

Subsequent Events

We have evaluated subsequent events or transactions that have occurred after the consolidated balance sheet date of June 30, 2022 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.

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ACCOUNTING CHANGES

6 Months Ended

Jun. 30, 2022

Accounting Changes and Error Corrections [Abstract]

ACCOUNTING CHANGES

ACCOUNTING CHANGESA 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 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), as amended through January 2021	Provides temporary optional guidance to ease the potential burden in applying GAAP to contract modifications and hedging relationships that reference London Inter-Bank Offered Rate ("LIBOR") or another reference rate expected to be discontinued, subject to meeting certain criteria.	We currently have interest rate derivative agreements with hedging relationships that reference LIBOR. This guidance provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. We are currently assessing the provisions of this guidance, and reviewing and updating our existing contracts, as applicable, for transition or fallback language that specifies how a replacement rate for LIBOR will be identified. We are also no longer using LIBOR as a reference rate for any new contracts. We do not expect that the adoption of this guidance will have a material impact on our consolidated financial statements and related disclosures. This guidance will be in effect from March 12, 2020 through December 31, 2022. See Note 7, Debt for further disclosure over our interest rate derivative agreements and debt instruments that reference LIBOR.
ASU No. 2021-08: Accounting for Contract Assets and Contract Liabilities from Contracts with Customers (Topic 805)	Requires entities to apply ASC 606 to recognize and measure contract assets and contract liabilities in a business combination. This guidance improves comparability after the business combination by providing consistent recognition and measurement guidance for revenue contracts with customers acquired in a business combination and revenue contracts with customers not acquired in a business combination.	We have made in the past, and we may make in the future, acquisitions to densify existing operations, expand service areas, and grow services for our customers, and these acquisitions may include contract assets or contract liabilities. We do not expect that the adoption of this guidance will have a material impact on our consolidated financial statements and related disclosures. This guidance is effective January 1, 2023 with early adoption permitted.

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REVENUE RECOGNITION

6 Months Ended

Jun. 30, 2022

Revenue from Contract with Customer [Abstract]

REVENUE RECOGNITION

REVENUE RECOGNITION

Revenues associated with our solid waste operations are derived mainly from solid waste collection and disposal services, including landfill, transfer station and transportation services, landfill gas-to-energy services, and processing services. Revenues associated with our resource-renewal services are derived from processing and non-processing services.

The following tables set forth revenues disaggregated by service line and timing of revenue recognition by operating segment for each of the three and six months ended June 30, 2022 and 2021:

Three Months Ended June 30, 2022

	Eastern		Western		Resource Solutions		Total Revenues
Collection	$	59,299	$	77,962	$	—	$	137,261
Landfill	6,542		18,599		—		25,141
Transfer	17,292		11,982		—		29,274
Transportation	1,765		4,024		—		5,789
Landfill gas-to-energy	249		1,504		—		1,753
Processing	2,116		813		33,867		36,796
Non-processing	—		—		47,652		47,652
Total revenues	$	87,263	$	114,884	$	81,519	$	283,666
Transferred at a point-in-time	$	117	$	517	$	18,813	$	19,447
Transferred over time	87,146		114,367		62,706		264,219
Total revenues	$	87,263	$	114,884	$	81,519	$	283,666

Three Months Ended June 30, 2021

	Eastern		Western		Resource Solutions		Total Revenues
Collection	$	39,364	$	67,963	$	—	$	107,327
Landfill	6,118		16,517		—		22,635
Transfer	13,475		9,976		—		23,451
Transportation	47		3,040		—		3,087
Landfill gas-to-energy	246		854		—		1,100
Processing	1,808		502		21,031		23,341
Non-processing	—		—		34,934		34,934
Total revenues	$	61,058	$	98,852	$	55,965	$	215,875
Transferred at a point-in-time	$	38	$	487	$	14,944	$	15,469
Transferred over time	61,020		98,365		41,021		200,406
Total revenues	$	61,058	$	98,852	$	55,965	$	215,875

Six Months Ended June 30, 2022

	Eastern		Western		Resource Solutions		Total Revenues
Collection	$	110,796	$	145,997	$	—	$	256,793
Landfill	11,918		32,788		—		44,706
Transfer	28,905		19,825		—		48,730
Transportation	3,238		6,682		—		9,920
Landfill gas-to-energy	522		3,885		—		4,407
Processing	3,203		1,546		61,263		66,012
Non-processing	—		—		87,125		87,125
Total revenues	$	158,582	$	210,723	$	148,388	$	517,693
Transferred at a point-in-time	$	236	$	1,028	$	33,900	$	35,164
Transferred over time	158,346		209,695		114,488		482,529
Total revenues	$	158,582	$	210,723	$	148,388	$	517,693

Six Months Ended June 30, 2021

	Eastern		Western		Resource Solutions		Total Revenues
Collection	$	75,440	$	129,356	$	—	$	204,796
Landfill	11,520		30,136		—		41,656
Transfer	22,899		17,123		—		40,022
Transportation	95		5,253		—		5,348
Landfill gas-to-energy	515		1,888		—		2,403
Processing	2,934		860		38,302		42,096
Non-processing	—		—		69,085		69,085
Total revenues	$	113,403	$	184,616	$	107,387	$	405,406
Transferred at a point-in-time	$	82	$	988	$	25,036	$	26,106
Transferred over time	113,321		183,628		82,351		379,300
Total revenues	$	113,403	$	184,616	$	107,387	$	405,406

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 $5,908 and $9,702 in the three and six months ended June 30, 2022, respectively, and $2,532 and $4,100 in the three and six months ended June 30, 2021, 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, 2022 or June 30, 2021 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 $111,601 and $89,232 as of June 30, 2022 and December 31, 2021, 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 $3,733 and $3,404 as of June 30, 2022 and December 31, 2021, 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, 2021 and December 31, 2020 was recognized as revenue during the six months ended June 30, 2022 and June 30, 2021, respectively, when the services were performed.

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BUSINESS COMBINATIONS

6 Months Ended

Jun. 30, 2022

Business Combination and Asset Acquisition [Abstract]

BUSINESS COMBINATIONS

BUSINESS COMBINATIONS

In the six months ended June 30, 2022, we acquired the following businesses: a full service solid-waste collection, recycling and transportation business in our Resource Solutions operating segment; a closed waste-to-energy facility that is being decommissioned and rebuilt as a transfer station and four tuck-in solid waste collection businesses in our Western region; a portable toilets business in our Eastern region; and a scrap metal collection business whose assets are allocated between our Eastern region and Resource Solutions operating segments. In the six months ended June 30, 2021, we acquired two tuck-in solid waste collection businesses in our Western region, along with a septic and portable toilet business and a tuck-in solid waste collection business in our Eastern region.

The operating results of these 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. Purchase price allocations are based on information existing at the acquisition dates or upon closing the transactions, including contingent consideration. Acquired intangible assets other than goodwill that are subject to amortization include customer relationships, trade names and covenants not-to-compete. Such assets are amortized over a four-year 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 and the purchase price allocation for acquisitions follows:

	Six Months Ended June 30,
	2022		2021
Purchase Price:
Cash used in acquisitions, net of cash acquired	$	55,053	$	4,378
Holdbacks	3,842		505
Total consideration	58,895		4,883
Allocated as follows:
Current assets	7,584		13
Property, plant and equipment:
Land	2,804		—
Buildings and improvements	5,308		—
Equipment	6,712		1,549
Operating lease right-of-use assets	405		—
Intangible assets:
Covenants not-to-compete	1,415		420
Customer relationships	9,725		1,226
Other non-current assets	40		—
Current liabilities	(3,577)		(82)
Operating lease liabilities, less current portion	(282)		—
Fair value of assets acquired and liabilities assumed	30,134		3,126
Excess purchase price allocated to goodwill	$	28,761	$	1,757

Certain purchase price allocations are preliminary and are based on information existing at the acquisition dates or upon closing the transaction. Accordingly, the 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, 2021 is as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
Revenues	$	284,314	$	246,623	$	525,012	$	467,326
Operating income	$	31,776	$	22,612	$	42,716	$	35,334
Net income	$	17,787	$	9,952	$	22,025	$	12,457
Basic earnings per share attributable to common stockholders:
Weighted average common shares outstanding	51,642		51,366		51,567		51,273
Basic earnings per common share	$	0.34	$	0.19	$	0.43	$	0.24
Diluted earnings per share attributable to common stockholders:
Weighted average common shares outstanding	51,781		51,546		51,720		51,466
Diluted earnings per common share	$	0.34	$	0.19	$	0.43	$	0.24

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, 2021 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.

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GOODWILL AND INTANGIBLE ASSETS

6 Months Ended

Jun. 30, 2022

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND INTANGIBLE ASSETS

GOODWILL AND INTANGIBLE ASSETS

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

	December 31, 2021		Acquisitions		Adjustments to Acquisitions		June 30, 2022
Eastern	$	52,072	$	93	$	237	$	52,402
Western	163,728		7,350		650		171,728
Resource Solutions	17,060		21,318		—		38,378
Total	$	232,860	$	28,761	$	887	$	262,508

Summaries of intangible assets by type follows:

	Covenants Not-to-Compete		Customer Relationships		Trade Names		Total
Balance, June 30, 2022
Intangible assets	$	30,193	$	124,680	$	8,350	$	163,223
Less accumulated amortization	(23,094)		(40,296)		(3,071)		(66,461)
	$	7,099	$	84,384	$	5,279	$	96,762

	Covenants Not-to-Compete		Customer Relationships		Trade Names		Total
Balance, December 31, 2021
Intangible assets	$	28,777	$	115,005	$	8,350	$	152,132
Less accumulated amortization	(22,148)		(34,809)		(1,452)		(58,409)
	$	6,629	$	80,196	$	6,898	$	93,723

Intangible amortization expense was $4,262 and $8,052 during the three and six months ended June 30, 2022, respectively, and $2,015 and $4,043 during the three and six months ended June 30, 2021, respectively.

A summary of intangible amortization expense estimated for the five fiscal years following fiscal year 2021 and thereafter follows:

Estimated Future Amortization Expense as of June 30, 2022
Fiscal year ending December 31, 2022	$	8,158
Fiscal year ending December 31, 2023	$	15,600
Fiscal year ending December 31, 2024	$	14,879
Fiscal year ending December 31, 2025	$	13,758
Fiscal year ending December 31, 2026	$	12,123
Thereafter	$	32,244

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ACCRUED FINAL CAPPING, CLOSURE AND POST CLOSURE

6 Months Ended

Jun. 30, 2022

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,
	2022		2021
Beginning balance	$	86,914	$	82,533
Obligations incurred	2,244		2,319
Revision in estimates (1)	1,443		—
Accretion expense	3,799		3,676
Obligations settled (2)	(2,027)		(2,969)
Ending balance	$	92,373	$	85,559

(1)Relates to a change in estimates concerning anticipated capping costs at one of our landfills.

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

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DEBT

6 Months Ended

Jun. 30, 2022

Debt And Derivatives Disclosure [Abstract]

DEBT

DEBT

A summary of debt is as follows:

	June 30, 2022		December 31, 2021
Senior Secured Credit Facility:
Term loan A facility ("Term Loan Facility") due December 2026; bearing interest at LIBOR plus 1.375%	$	350,000	$	350,000
Revolving credit facility due December 2026 ("Revolving Credit Facility"); bearing interest at LIBOR plus 1.375%	—		—
Tax-Exempt Bonds:
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014 ("New York Bonds 2014R-1") due December 2044 - fixed rate interest period through 2029; 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
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2020 ("New York Bonds 2020") due September 2050 - fixed rate interest period through 2025; bearing interest at 2.750%	40,000		40,000
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 2013") due April 2036 - fixed rate interest period through 2028; bearing interest at 4.625%	16,000		16,000
Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2022A-1 ("Vermont Bonds 2022A-1") due June 2052 - fixed rate interest period through 2027; bearing interest at 5.00%	35,000		—
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 3.6%	45,889		45,724
Notes payable maturing through August 2024; bearing interest at a weighted average of 1.6%	773		4,846
Principal amount of debt	593,662		562,570
Less—unamortized debt issuance costs (1)	10,470		10,166
Debt less unamortized debt issuance costs	583,192		552,404
Less—current maturities of debt	7,636		9,901
	$	575,556	$	542,503

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

	June 30, 2022		December 31, 2021
Revolving Credit Facility and Term Loan Facility (collectively, the "Credit Facility")	$	5,306	$	5,884
New York Bonds 2014R-1	899		933
New York Bonds 2014R-2	238		268
New York Bonds 2020	1,194		1,283
FAME Bonds 2005R-3	219		262
FAME Bonds 2015R-1	378		413
FAME Bonds 2015R-2	231		268
Vermont Bonds 2013	405		433
Vermont Bonds 2022A-1	1,207		—
New Hampshire Bonds	393		422
	$	10,470	$	10,166

Financing Activities

In the three months ended June 30, 2022, we completed the issuance of $35,000 aggregate principal amount of Vermont Bonds 2022A-1. The Vermont Bonds 2022A-1, which are unsecured and guaranteed jointly and severally, fully and unconditionally by all of our significant wholly-owned subsidiaries, accrue interest at 5.00% per annum from June 1, 2022 through May 31, 2027, at which time they may be converted to a variable interest rate period or to a new term interest rate period. The Vermont Bonds 2022A-1 mature on June 1, 2052. As of June 30, 2022, we had $1,006 of remaining cash proceeds from the issuance of the Vermont Bonds 2022A-1 included in restricted cash and assets that is restricted to finance or reimburse certain noncurrent asset costs associated with capital projects in the State of Vermont.

Credit Facility

As of June 30, 2022, we are party to an amended and restated credit agreement ("Credit Agreement"), which provides for a $350,000 aggregate principal amount Term Loan Facility and a $300,000 Revolving Credit Facility, with a $75,000 sublimit for letters of credit. 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 December 2026 and bears interest at a rate of LIBOR plus 1.375% per annum, which will be reduced to a rate of LIBOR plus as low as 1.125% upon us reaching a consolidated net leverage ratio of less than 2.25x. The Credit Agreement contains customary benchmark replacement provisions pursuant to which, upon certain triggering events, the LIBOR benchmark used to calculate the LIBOR rate will be replaced with a secured overnight financing rate, as adjusted, on the terms and conditions in the Credit Agreement. 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, 2022, further advances were available under the Revolving Credit Facility in the amount of $271,805. The available amount is net of outstanding irrevocable letters of credit totaling $28,195, and as of June 30, 2022 no amount had been drawn.

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. We have designated these derivative instruments as highly effective cash flow hedges, and therefore the change in their fair value is recorded in stockholders’ equity as a component of accumulated other comprehensive income (loss), net of tax 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.

As of June 30, 2022 and December 31, 2021, our active interest rate derivative agreements had total notional amounts of $190,000 and $195,000, respectively. According to the terms of the agreements, we receive interest based on the 1-month LIBOR index, in some instances restricted by a 0.0% floor, and pay interest at a weighted average rate of approximately 2.20%. The agreements mature between May 2023 and June 2027.

As of December 31, 2021, we had forward starting interest rate derivative agreements with a total notional amount of $85,000 outstanding. As of June 30, 2022, we have a forward starting interest rate derivative agreement with a total notional amount of $20,000 after considering any forward starting interest rate derivative agreements that became effective in the current period. According to the terms of this agreement, we will receive interest based on the 1-month LIBOR index, restricted by a 0.0% floor, and will pay interest at a rate of 1.29%. The agreement matures in May 2028.

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, 2022		December 31, 2021
Interest rate swaps	Other current assets	$	1,454	$	—
Interest rate swaps	Other non-current assets	5,508		424
		$	6,962	$	424
Interest rate swaps	Other accrued liabilities	$	—	$	3,796
Interest rate swaps	Other long-term liabilities	—		1,380
		$	—	$	5,176
Interest rate swaps	Accumulated other comprehensive income (loss), net of tax	$	6,962	$	(4,935)
Interest rate swaps - tax effect	Accumulated other comprehensive income (loss), net of tax	(2,942)		(168)
		$	4,020	$	(5,103)

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

	Three Months Ended June 30,				Six Months Ended June 30,
Statement of Operations Location	2022		2021		2022		2021
Interest expense	$	994	$	1,202	$	2,122	$	2,347

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COMMITMENTS AND CONTINGENCIES

6 Months Ended

Jun. 30, 2022

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENCIES

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. The plaintiffs in some actions seek unspecified damages or injunctive relief, or both. These actions fall within various procedural stages at any point in time, and some are covered in part by insurance.

In accordance with FASB ASC 450 - Contingencies, we accrue for legal proceedings, inclusive of legal costs, when losses become probable and reasonably estimable. We have recorded an aggregate accrual of $1,291 relating to our outstanding legal proceedings as of June 30, 2022. 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. We disclose outstanding matters that we believe could have a material adverse effect on our financial condition, results of operations or cash flows.

North Country Environmental Services Expansion Permit

On October 9, 2020, our subsidiary, North Country Environmental Services, Inc. ("NCES"), received a Type I-A Permit Modification (the "Permit") for Expansion in the Stage VI area of the NCES landfill located in Bethlehem, New Hampshire. On November 9, 2020, the Conservation Law Foundation ("CLF") filed an appeal of the Permit to the New Hampshire Waste Management Council (the “Council”) on the grounds it failed to meet the public benefit criteria. On January 19, 2021, CLF filed a Complaint for Injunctive Relief with the Grafton Superior Court to enjoin NCES from accepting waste pursuant to the new Permit until such a time as CLF has exhausted its appeal rights. A hearing on the Complaint for Injunctive Relief was held on March 10, 2021; the Grafton Superior Court denied the motion on May 14, 2021. CLF did not appeal this decision. The Council denied NCES’s Motion to Dismiss CLF’s appeal for lack of standing by Order dated March 17, 2021. NCES filed a Motion to Reconsider on March 26, 2021, which was denied by the Council on May 11, 2021. A prehearing conference was held and a schedule for the case was established on June 8, 2021. NCES filed a Motion to Dismiss on the merits of the appeal on June 30, 2021. On July 16, 2021, CLF filed its objection to the Motion to Dismiss, and NCES filed its reply on July 26, 2021. The Council issued an Order on September 3, 2021 granting NCES’s Motion to Dismiss, in part. CLF filed a Motion for Reconsideration on September 23, 2021, and NCES filed its objection on September 28, 2021 and CLF filed a reply on September 30, 2021. CLF’s Motion for Reconsideration was granted on November 19, 2021, and its dismissed claims reinstated. On January 14, 2022, NCES filed a Motion in Limine seeking to exclude from evidence four potential evidentiary items on the basis that those items were either not directly related, or were not included in CLF’s Notice of Appeal. On January 21, 2022, CLF filed an objection to NCES’s motion, and NCES filed a reply on January 26, 2022. On January 31, 2022, the Council issued an Order granting NCES’s Motion in Limine with respect to three of the four items it sought to exclude from evidence, and denying its motion with respect to the remaining item. On February 18 and February 22, 2022, a quorum of the Council and Hearing Officer held a hearing on the appeal. Council deliberations occurred and were concluded on February 22, 2022,with the Council ruling in favor of NCES on all motions concerning questions of fact, and indicating that a written decision incorporating the Hearing Officer’s decision as to questions of law would follow. On May 11, 2022, an Order was issued denying all of CLF’s arguments on appeal, with the exception of one; the Hearing Officer held that based on his interpretation of the relevant statute, the public benefit determination made by the New Hampshire Department of Environmental Services (“DES”), in issuing the Permit to NCES, was unlawful, and remanded the Permit to the DES with regard to this determination. DES filed a Motion for Reconsideration with the Council on May 31, 2022 (the “DES Reconsideration Motion”) and NCES filed a Motion for Rehearing on June 10, 2022 (the “NCES Rehearing Motion”). The Hearing Officer suspended his May 11, 2022 decision by Order dated June 20, 2022, pending consideration of the DES Reconsideration Motion and NCES Rehearing Motion. On June 24, 2022, CLF filed an Objection and Motion to Strike with respect to the NCES Rehearing Motion as well as an Objection to the DES Reconsideration Motion, and DES filed a Limited Objection to the NCES Rehearing Motion, each to which NCES submitted a Reply on July 6, 2022. On July 18, 2022, CLF filed a Reply in Support of its Motion to Strike and Limited Surreply in Support of Objection to the NCES Motion for Rehearing. On July 21, 2022, NCES filed an Assented to Motion for Leave to File Limited Surreply to CLF’s Motion to Strike together with a Limited Surreply to CLF’s Motion to Strike. The outcome remains pending. NCES will continue to vigorously defend against this litigation.

Environmental Remediation Liabilities

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.

We accrue for costs associated with environmental remediation obligations when such costs become both probable and reasonably estimable. Determining the method and ultimate cost of remediation requires that a number of assumptions be made. There can sometimes be a range of reasonable estimates of the costs associated with remediation of a site. In these cases, we use the amount within the range that constitutes our best estimate. In the early stages of the remediation process, particular components of the overall liability may not be reasonably estimable; in this instance we use the components of the liability that can be reasonably estimated as a surrogate for the liability. It is reasonably possible that we will need to adjust the liabilities recorded for remediation to reflect the effects of new or additional information, to the extent such information impacts the costs, timing or duration of the required actions. Future changes in our estimates of the cost, timing or duration of the required actions could have a material adverse effect on our consolidated financial position, results of operations and cash flows. We disclose outstanding environmental remediation matters that remain unsettled or are settled in the reporting period that we believe could have a material adverse effect on our financial condition, results of operations or cash flows.

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. The weighted average risk-free interest rate associated with our environmental remediation liabilities as of June 30, 2022 ranges between 1.5% and 2.6%. A summary of the changes to the aggregate environmental remediation liabilities for the six months ended June 30, 2022 and 2021 follows:

	Six Months Ended June 30,
	2022		2021
Beginning balance	$	5,887	$	5,200
Accretion expense	54		56
Obligations settled (1)	(72)		(281)
Ending balance	5,869		4,975
Less: current portion	280		375
Long-term portion	$	5,589	$	4,600

(1)May include amounts paid and amounts that are being processed through accounts payable as a part of our disbursement cycle.

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STOCKHOLDERS' EQUITY

6 Months Ended

Jun. 30, 2022

Equity [Abstract]

STOCKHOLDERS' EQUITY

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, 2022, there were 868 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, 2021	77	$	15.68
Granted	—	$	—
Exercised	(23)	$	8.56
Forfeited	—	$	—
Outstanding, June 30, 2022	54	$	18.62	4.3	$	2,946
Exercisable, June 30, 2022	46	$	9.49	3.5	$	2,913

Stock-based compensation expense related to stock options was $17 and $33 during the three and six months ended June 30, 2022, respectively. We did not record any stock-based compensation expense for stock options during the three and six months ended June 30, 2021. As of June 30, 2022, we had $139 of unrecognized stock-based compensation expense related to outstanding stock options to be recognized over a weighted average period of 2.1 years.

During the three and six months ended June 30, 2022, the aggregate intrinsic value of stock options exercised was $1,156 and $1,467, 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, if applicable, 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, 2021	249	$	55.40
Granted	82	$	94.31
Class A Common Stock Vested	(63)	$	49.00
Forfeited	(34)	$	67.73
Outstanding, June 30, 2022	234	$	68.86	1.9	$	17,031
Unvested, June 30, 2022	418	$	68.97	1.6	$	30,407

(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 184 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 $828 and $2,979 during the three and six months ended June 30, 2022, respectively, as compared to $3,044 and $5,928 during the three and six months ended June 30, 2021, respectively.

During the three and six months ended June 30, 2022, the total fair value of other stock awards vested was $814 and $5,359, respectively.

As of June 30, 2022, total unrecognized stock-based compensation expense related to outstanding restricted stock was $58, which will be recognized over a weighted average period of 1.5 years. As of June 30, 2022, total unrecognized stock-based compensation expense related to outstanding restricted stock units was $5,543, which will be recognized over a weighted average period of 1.9 years. As of June 30, 2022, total expected unrecognized stock-based compensation expense related to outstanding performance stock units was $6,882 to be recognized over a weighted average period of 1.8 years.

We also recorded $93 and $166 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, 2022, respectively, as compared to $72 and $128 during the three and six months ended June 30, 2021, respectively.

Accumulated Other Comprehensive Income (Loss), Net of Tax

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

	Interest Rate Swaps
Balance, December 31, 2021	$	(5,103)
Other comprehensive income before reclassifications	9,774
Amounts reclassified from accumulated other comprehensive income (loss)	2,122
Income tax provision related to items of other comprehensive income	(2,773)
Net current-period other comprehensive income	9,123
Balance, June 30, 2022	$	4,020

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

	Three Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
Details About Accumulated Other Comprehensive Income (Loss), Net of Tax Components	Amounts Reclassified Out of Accumulated Other Comprehensive Income (Loss), Net of Tax								Affected Line Item in the Consolidated Statements of Operations
Interest rate swaps	$	994	$	1,202	$	2,122	$	2,347	Interest expense
	(994)		(1,202)		(2,122)		(2,347)		Income before income taxes
	—		(142)		(190)		(269)		Provision for income taxes
	$	(994)	$	(1,060)	$	(1,932)	$	(2,078)	Net income

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EARNINGS PER SHARE

6 Months Ended

Jun. 30, 2022

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,
	2022		2021		2022		2021
Numerator:
Net income	$	17,796	$	11,783	$	21,986	$	16,094
Denominators:
Number of shares outstanding, end of period:
Class A common stock	50,690		50,398		50,690		50,398
Class B common stock	988		988		988		988
Unvested restricted stock	(2)		(2)		(2)		(2)
Effect of weighted average shares outstanding	(34)		(18)		(109)		(111)
Basic weighted average common shares outstanding	51,642		51,366		51,567		51,273
Impact of potentially dilutive securities:
Dilutive effect of stock options and other stock awards	139		180		153		193
Diluted weighted average common shares outstanding	51,781		51,546		51,720		51,466
Anti-dilutive potentially issuable shares	70		—		70		48

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OTHER ITEMS AND CHARGES

6 Months Ended

Jun. 30, 2022

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, 2022, we recorded charges of $1,019 and $3,062, respectively, and in the three and six months ended June 30, 2021, we recorded charges of $1,632 and $2,046, respectively, comprised primarily of legal, consulting and other similar costs associated with due diligence and the acquisition and integration of acquired businesses or select development projects.

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FAIR VALUE OF FINANCIAL INSTRUMENTS

6 Months Ended

Jun. 30, 2022

Fair Value Disclosures [Abstract]

FAIR VALUE OF FINANCIAL INSTRUMENTS

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 derivatives, contingent consideration related to acquisitions, trade payables and debt. The carrying values of cash and cash equivalents, restricted cash, 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 derivatives 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. We recognize all derivatives accounted for on the balance sheet at fair value.

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, 2022 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	$	1,799	$	—	$	—
Interest rate swaps	—		6,962		—
	$	1,799	$	6,962	$	—

	Fair Value Measurement at December 31, 2021 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	$	2,122	$	—	$	—
Interest rate swaps	—		424		—
	$	2,122	$	424	$	—
Liabilities:
Interest rate swaps	$	—	$	5,176	$	—

Fair Value of Debt

As of June 30, 2022, the fair value of our fixed rate debt, including our FAME Bonds 2005R-3, FAME Bonds 2015R-1, FAME Bonds 2015R-2, Vermont Bonds 2013, Vermont Bonds 2022A-1, New York Bonds 2014R-1, New York Bonds 2014R-2, New York Bonds 2020 and New Hampshire Bonds (collectively, the "Industrial Revenue Bonds") was approximately $189,558 and the carrying value was $197,000. The fair value of the Industrial Revenue 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, 2022, the carrying value of our Term Loan Facility was $350,000 and the carrying value of our Revolving Credit Facility was $0. 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 the Industrial Revenue 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.

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SEGMENT REPORTING

6 Months Ended

Jun. 30, 2022

Segment Reporting [Abstract]

SEGMENT REPORTING

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, transfer, transportation and disposal, landfill gas-to-energy, processing, and recycling services in the northeastern United States. Our Resource Solutions operating segment leverages our core competencies in materials processing, industrial recycling, organics and resource management service offerings to deliver a comprehensive solution for our larger commercial, municipal, institutional and industrial customers that have more diverse waste and recycling needs. Revenues associated with our Resource Solutions operations are derived from two lines-of-service: processing and non-processing. Revenues from processing services are derived from municipalities and customers in the form of processing fees, tipping fees, commodity sales, and organic material sales. Revenues from non-processing services are derived from brokerage services and overall resource management services providing a wide range of environmental services and resource management solutions to large and complex organizations, as well as traditional collection, disposal and recycling services provided to large account multi-site customers. Legal, tax, information technology, human resources, certain finance and accounting and other administrative functions are included in our Corporate Entities segment, which is not a reportable operating segment. Corporate Entities results reflect those costs not allocated to our reportable operating segments.

Three Months Ended June 30, 2022

Segment	Outside revenues		Inter-company revenues		Depreciation and amortization		Operating income (loss)		Total assets
Eastern	$	87,263	$	22,147	$	11,538	$	6,150	$	362,942
Western	114,884		39,491		15,939		19,897		697,252
Resource Solutions	81,519		317		3,110		6,235		189,820
Corporate entities	—		—		563		(563)		120,705
Eliminations	—		(61,955)		—		—		—
	$	283,666	$	—	$	31,150	$	31,719	$	1,370,719

Three Months Ended June 30, 2021

Segment	Outside revenues		Inter-company revenues		Depreciation and amortization		Operating income (loss)		Total assets
Eastern	$	61,058	$	16,128	$	7,313	$	3,781	$	226,157
Western	98,852		33,566		15,089		14,900		654,314
Resource Solutions	55,965		1,277		1,548		3,651		95,664
Corporate entities	—		—		387		(386)		251,698
Eliminations	—		(50,971)		—		—		—
	$	215,875	$	—	$	24,337	$	21,946	$	1,227,833

Six Months Ended June 30, 2022

Segment	Outside revenues		Inter-company revenues		Depreciation and amortization		Operating income (loss)		Total assets
Eastern	$	158,582	$	38,815	$	22,988	$	3,920	$	362,942
Western	210,723		71,983		30,598		29,160		697,252
Resource Solutions	148,388		1,095		5,872		9,928		189,820
Corporate Entities	—		—		1,121		(1,121)		120,705
Eliminations	—		(111,893)		—		—		—
Total	$	517,693	$	—	$	60,579	$	41,887	$	1,370,719

Six Months Ended June 30, 2021

Segment	Outside revenues		Inter-company revenues		Depreciation and amortization		Operating income (loss)		Total assets
Eastern	$	113,403	$	28,554	$	13,935	$	6,027	$	226,157
Western	184,616		62,248		29,128		22,657		654,314
Resource Solutions	107,387		3,180		3,116		6,113		95,664
Corporate Entities	—		—		840		(842)		251,698
Eliminations	—		(93,982)		—		—		—
Total	$	405,406	$	—	$	47,019	$	33,955	$	1,227,833

A summary of our revenues attributable to services provided follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
Collection	$	137,261	$	107,327	$	256,793	$	204,796
Disposal	60,204		49,173		103,356		87,026
Power generation	1,753		1,100		4,407		2,403
Processing	2,929		2,310		4,749		3,794
Solid waste operations	202,147		159,910		369,305		298,019
Processing	33,867		21,031		61,263		38,302
Non-processing	47,652		34,934		87,125		69,085
Resource Solutions operations	81,519		55,965		148,388		107,387
Total revenues	$	283,666	$	215,875	$	517,693	$	405,406

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ACCOUNTING CHANGES (Policies)

6 Months Ended

Jun. 30, 2022

Accounting Changes and Error Corrections [Abstract]

Basis of Accounting

Casella Waste Systems, Inc. (“Parent”), and its subsidiaries (collectively, “we”, “us” or “our”), is a regional, vertically integrated solid waste services company. We provide resource management expertise and services to residential, commercial, municipal, institutional and industrial customers, primarily in the areas of solid waste collection and disposal, transfer, recycling and organics services. We provide integrated solid waste services in seven states: Vermont, New Hampshire, New York, Massachusetts, Connecticut, Maine and Pennsylvania, with our headquarters located in Rutland, Vermont. We 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. We manage our resource-renewal operations through the Resource Solutions operating segment, which leverages our core competencies in materials processing, industrial recycling, organics and resource management service offerings to deliver a comprehensive solution for our larger commercial, municipal, institutional and industrial customers that have more diverse waste and recycling needs. Legal, tax, information technology, human resources, certain finance and accounting and other administrative functions are included in our Corporate Entities segment.

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, "Financial Statements and Supplementary Data" of our Annual Report on Form 10-K for the fiscal year ended December 31, 2021 ("fiscal year 2021"), which was filed with the SEC on February 18, 2022.

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, 2022 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, 2022 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 Adopted and Pending Adoption

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 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), as amended through January 2021	Provides temporary optional guidance to ease the potential burden in applying GAAP to contract modifications and hedging relationships that reference London Inter-Bank Offered Rate ("LIBOR") or another reference rate expected to be discontinued, subject to meeting certain criteria.	We currently have interest rate derivative agreements with hedging relationships that reference LIBOR. This guidance provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. We are currently assessing the provisions of this guidance, and reviewing and updating our existing contracts, as applicable, for transition or fallback language that specifies how a replacement rate for LIBOR will be identified. We are also no longer using LIBOR as a reference rate for any new contracts. We do not expect that the adoption of this guidance will have a material impact on our consolidated financial statements and related disclosures. This guidance will be in effect from March 12, 2020 through December 31, 2022. See Note 7, Debt for further disclosure over our interest rate derivative agreements and debt instruments that reference LIBOR.
ASU No. 2021-08: Accounting for Contract Assets and Contract Liabilities from Contracts with Customers (Topic 805)	Requires entities to apply ASC 606 to recognize and measure contract assets and contract liabilities in a business combination. This guidance improves comparability after the business combination by providing consistent recognition and measurement guidance for revenue contracts with customers acquired in a business combination and revenue contracts with customers not acquired in a business combination.	We have made in the past, and we may make in the future, acquisitions to densify existing operations, expand service areas, and grow services for our customers, and these acquisitions may include contract assets or contract liabilities. We do not expect that the adoption of this guidance will have a material impact on our consolidated financial statements and related disclosures. This guidance is effective January 1, 2023 with early adoption permitted.

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

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 derivatives, contingent consideration related to acquisitions, trade payables and debt. The carrying values of cash and cash equivalents, restricted cash, 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 derivatives 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. We recognize all derivatives accounted for on the balance sheet at fair value.

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, transfer, transportation and disposal, landfill gas-to-energy, processing, and recycling services in the northeastern United States. Our Resource Solutions operating segment leverages our core competencies in materials processing, industrial recycling, organics and resource management service offerings to deliver a comprehensive solution for our larger commercial, municipal, institutional and industrial customers that have more diverse waste and recycling needs. Revenues associated with our Resource Solutions operations are derived from two lines-of-service: processing and non-processing. Revenues from processing services are derived from municipalities and customers in the form of processing fees, tipping fees, commodity sales, and organic material sales. Revenues from non-processing services are derived from brokerage services and overall resource management services providing a wide range of environmental services and resource management solutions to large and complex organizations, as well as traditional collection, disposal and recycling services provided to large account multi-site customers. Legal, tax, information technology, human resources, certain finance and accounting and other administrative functions are included in our Corporate Entities segment, which is not a reportable operating segment. Corporate Entities results reflect those costs not allocated to our reportable operating segments.

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ACCOUNTING CHANGES (Tables)

6 Months Ended

Jun. 30, 2022

Accounting Changes and Error Corrections [Abstract]

Schedule of New Accounting Pronouncements and Changes in Accounting Principles

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 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), as amended through January 2021	Provides temporary optional guidance to ease the potential burden in applying GAAP to contract modifications and hedging relationships that reference London Inter-Bank Offered Rate ("LIBOR") or another reference rate expected to be discontinued, subject to meeting certain criteria.	We currently have interest rate derivative agreements with hedging relationships that reference LIBOR. This guidance provides optional expedients and exceptions for applying GAAP to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met. We are currently assessing the provisions of this guidance, and reviewing and updating our existing contracts, as applicable, for transition or fallback language that specifies how a replacement rate for LIBOR will be identified. We are also no longer using LIBOR as a reference rate for any new contracts. We do not expect that the adoption of this guidance will have a material impact on our consolidated financial statements and related disclosures. This guidance will be in effect from March 12, 2020 through December 31, 2022. See Note 7, Debt for further disclosure over our interest rate derivative agreements and debt instruments that reference LIBOR.
ASU No. 2021-08: Accounting for Contract Assets and Contract Liabilities from Contracts with Customers (Topic 805)	Requires entities to apply ASC 606 to recognize and measure contract assets and contract liabilities in a business combination. This guidance improves comparability after the business combination by providing consistent recognition and measurement guidance for revenue contracts with customers acquired in a business combination and revenue contracts with customers not acquired in a business combination.	We have made in the past, and we may make in the future, acquisitions to densify existing operations, expand service areas, and grow services for our customers, and these acquisitions may include contract assets or contract liabilities. We do not expect that the adoption of this guidance will have a material impact on our consolidated financial statements and related disclosures. This guidance is effective January 1, 2023 with early adoption permitted.

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REVENUE RECOGNITION (Tables)

6 Months Ended

Jun. 30, 2022

Revenue from Contract with Customer [Abstract]

Schedule of Disaggregation of Revenue

The following tables set forth revenues disaggregated by service line and timing of revenue recognition by operating segment for each of the three and six months ended June 30, 2022 and 2021:

Three Months Ended June 30, 2022

	Eastern		Western		Resource Solutions		Total Revenues
Collection	$	59,299	$	77,962	$	—	$	137,261
Landfill	6,542		18,599		—		25,141
Transfer	17,292		11,982		—		29,274
Transportation	1,765		4,024		—		5,789
Landfill gas-to-energy	249		1,504		—		1,753
Processing	2,116		813		33,867		36,796
Non-processing	—		—		47,652		47,652
Total revenues	$	87,263	$	114,884	$	81,519	$	283,666
Transferred at a point-in-time	$	117	$	517	$	18,813	$	19,447
Transferred over time	87,146		114,367		62,706		264,219
Total revenues	$	87,263	$	114,884	$	81,519	$	283,666

Three Months Ended June 30, 2021

	Eastern		Western		Resource Solutions		Total Revenues
Collection	$	39,364	$	67,963	$	—	$	107,327
Landfill	6,118		16,517		—		22,635
Transfer	13,475		9,976		—		23,451
Transportation	47		3,040		—		3,087
Landfill gas-to-energy	246		854		—		1,100
Processing	1,808		502		21,031		23,341
Non-processing	—		—		34,934		34,934
Total revenues	$	61,058	$	98,852	$	55,965	$	215,875
Transferred at a point-in-time	$	38	$	487	$	14,944	$	15,469
Transferred over time	61,020		98,365		41,021		200,406
Total revenues	$	61,058	$	98,852	$	55,965	$	215,875

Six Months Ended June 30, 2022

	Eastern		Western		Resource Solutions		Total Revenues
Collection	$	110,796	$	145,997	$	—	$	256,793
Landfill	11,918		32,788		—		44,706
Transfer	28,905		19,825		—		48,730
Transportation	3,238		6,682		—		9,920
Landfill gas-to-energy	522		3,885		—		4,407
Processing	3,203		1,546		61,263		66,012
Non-processing	—		—		87,125		87,125
Total revenues	$	158,582	$	210,723	$	148,388	$	517,693
Transferred at a point-in-time	$	236	$	1,028	$	33,900	$	35,164
Transferred over time	158,346		209,695		114,488		482,529
Total revenues	$	158,582	$	210,723	$	148,388	$	517,693

Six Months Ended June 30, 2021

	Eastern		Western		Resource Solutions		Total Revenues
Collection	$	75,440	$	129,356	$	—	$	204,796
Landfill	11,520		30,136		—		41,656
Transfer	22,899		17,123		—		40,022
Transportation	95		5,253		—		5,348
Landfill gas-to-energy	515		1,888		—		2,403
Processing	2,934		860		38,302		42,096
Non-processing	—		—		69,085		69,085
Total revenues	$	113,403	$	184,616	$	107,387	$	405,406
Transferred at a point-in-time	$	82	$	988	$	25,036	$	26,106
Transferred over time	113,321		183,628		82,351		379,300
Total revenues	$	113,403	$	184,616	$	107,387	$	405,406

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BUSINESS COMBINATIONS (Tables)

6 Months Ended

Jun. 30, 2022

Business Combination and Asset Acquisition [Abstract]

Summary of Purchase Price Paid for Acquisitions

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

	Six Months Ended June 30,
	2022		2021
Purchase Price:
Cash used in acquisitions, net of cash acquired	$	55,053	$	4,378
Holdbacks	3,842		505
Total consideration	58,895		4,883
Allocated as follows:
Current assets	7,584		13
Property, plant and equipment:
Land	2,804		—
Buildings and improvements	5,308		—
Equipment	6,712		1,549
Operating lease right-of-use assets	405		—
Intangible assets:
Covenants not-to-compete	1,415		420
Customer relationships	9,725		1,226
Other non-current assets	40		—
Current liabilities	(3,577)		(82)
Operating lease liabilities, less current portion	(282)		—
Fair value of assets acquired and liabilities assumed	30,134		3,126
Excess purchase price allocated to goodwill	$	28,761	$	1,757

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, 2021 is as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
Revenues	$	284,314	$	246,623	$	525,012	$	467,326
Operating income	$	31,776	$	22,612	$	42,716	$	35,334
Net income	$	17,787	$	9,952	$	22,025	$	12,457
Basic earnings per share attributable to common stockholders:
Weighted average common shares outstanding	51,642		51,366		51,567		51,273
Basic earnings per common share	$	0.34	$	0.19	$	0.43	$	0.24
Diluted earnings per share attributable to common stockholders:
Weighted average common shares outstanding	51,781		51,546		51,720		51,466
Diluted earnings per common share	$	0.34	$	0.19	$	0.43	$	0.24

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GOODWILL AND INTANGIBLE ASSETS (Tables)

6 Months Ended

Jun. 30, 2022

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Goodwill Activity

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

	December 31, 2021		Acquisitions		Adjustments to Acquisitions		June 30, 2022
Eastern	$	52,072	$	93	$	237	$	52,402
Western	163,728		7,350		650		171,728
Resource Solutions	17,060		21,318		—		38,378
Total	$	232,860	$	28,761	$	887	$	262,508

Summary of Intangible Assets by Type

Summaries of intangible assets by type follows:

	Covenants Not-to-Compete		Customer Relationships		Trade Names		Total
Balance, June 30, 2022
Intangible assets	$	30,193	$	124,680	$	8,350	$	163,223
Less accumulated amortization	(23,094)		(40,296)		(3,071)		(66,461)
	$	7,099	$	84,384	$	5,279	$	96,762

	Covenants Not-to-Compete		Customer Relationships		Trade Names		Total
Balance, December 31, 2021
Intangible assets	$	28,777	$	115,005	$	8,350	$	152,132
Less accumulated amortization	(22,148)		(34,809)		(1,452)		(58,409)
	$	6,629	$	80,196	$	6,898	$	93,723

Summary of Intangible Amortization Expense Estimated

A summary of intangible amortization expense estimated for the five fiscal years following fiscal year 2021 and thereafter follows:

Estimated Future Amortization Expense as of June 30, 2022
Fiscal year ending December 31, 2022	$	8,158
Fiscal year ending December 31, 2023	$	15,600
Fiscal year ending December 31, 2024	$	14,879
Fiscal year ending December 31, 2025	$	13,758
Fiscal year ending December 31, 2026	$	12,123
Thereafter	$	32,244

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ACCRUED FINAL CAPPING, CLOSURE AND POST CLOSURE (Tables)

6 Months Ended

Jun. 30, 2022

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,
	2022		2021
Beginning balance	$	86,914	$	82,533
Obligations incurred	2,244		2,319
Revision in estimates (1)	1,443		—
Accretion expense	3,799		3,676
Obligations settled (2)	(2,027)		(2,969)
Ending balance	$	92,373	$	85,559

(1)Relates to a change in estimates concerning anticipated capping costs at one of our landfills.

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

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DEBT (Tables)

6 Months Ended

Jun. 30, 2022

Debt And Derivatives Disclosure [Abstract]

Summary of Debt

A summary of debt is as follows:

	June 30, 2022		December 31, 2021
Senior Secured Credit Facility:
Term loan A facility ("Term Loan Facility") due December 2026; bearing interest at LIBOR plus 1.375%	$	350,000	$	350,000
Revolving credit facility due December 2026 ("Revolving Credit Facility"); bearing interest at LIBOR plus 1.375%	—		—
Tax-Exempt Bonds:
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014 ("New York Bonds 2014R-1") due December 2044 - fixed rate interest period through 2029; 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
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2020 ("New York Bonds 2020") due September 2050 - fixed rate interest period through 2025; bearing interest at 2.750%	40,000		40,000
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 2013") due April 2036 - fixed rate interest period through 2028; bearing interest at 4.625%	16,000		16,000
Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2022A-1 ("Vermont Bonds 2022A-1") due June 2052 - fixed rate interest period through 2027; bearing interest at 5.00%	35,000		—
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 3.6%	45,889		45,724
Notes payable maturing through August 2024; bearing interest at a weighted average of 1.6%	773		4,846
Principal amount of debt	593,662		562,570
Less—unamortized debt issuance costs (1)	10,470		10,166
Debt less unamortized debt issuance costs	583,192		552,404
Less—current maturities of debt	7,636		9,901
	$	575,556	$	542,503

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

	June 30, 2022		December 31, 2021
Revolving Credit Facility and Term Loan Facility (collectively, the "Credit Facility")	$	5,306	$	5,884
New York Bonds 2014R-1	899		933
New York Bonds 2014R-2	238		268
New York Bonds 2020	1,194		1,283
FAME Bonds 2005R-3	219		262
FAME Bonds 2015R-1	378		413
FAME Bonds 2015R-2	231		268
Vermont Bonds 2013	405		433
Vermont Bonds 2022A-1	1,207		—
New Hampshire Bonds	393		422
	$	10,470	$	10,166

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, 2022		December 31, 2021
Interest rate swaps	Other current assets	$	1,454	$	—
Interest rate swaps	Other non-current assets	5,508		424
		$	6,962	$	424
Interest rate swaps	Other accrued liabilities	$	—	$	3,796
Interest rate swaps	Other long-term liabilities	—		1,380
		$	—	$	5,176
Interest rate swaps	Accumulated other comprehensive income (loss), net of tax	$	6,962	$	(4,935)
Interest rate swaps - tax effect	Accumulated other comprehensive income (loss), net of tax	(2,942)		(168)
		$	4,020	$	(5,103)

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

	Three Months Ended June 30,				Six Months Ended June 30,
Statement of Operations Location	2022		2021		2022		2021
Interest expense	$	994	$	1,202	$	2,122	$	2,347

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COMMITMENTS AND CONTINGENCIES (Tables)

6 Months Ended

Jun. 30, 2022

Commitments and Contingencies Disclosure [Abstract]

Summary of Environmental Liability

A summary of the changes to the aggregate environmental remediation liabilities for the six months ended June 30, 2022 and 2021 follows:

	Six Months Ended June 30,
	2022		2021
Beginning balance	$	5,887	$	5,200
Accretion expense	54		56
Obligations settled (1)	(72)		(281)
Ending balance	5,869		4,975
Less: current portion	280		375
Long-term portion	$	5,589	$	4,600

(1)May include amounts paid and amounts that are being processed through accounts payable as a part of our disbursement cycle.

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STOCKHOLDERS' EQUITY (Tables)

6 Months Ended

Jun. 30, 2022

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, 2021	77	$	15.68
Granted	—	$	—
Exercised	(23)	$	8.56
Forfeited	—	$	—
Outstanding, June 30, 2022	54	$	18.62	4.3	$	2,946
Exercisable, June 30, 2022	46	$	9.49	3.5	$	2,913

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, 2021	249	$	55.40
Granted	82	$	94.31
Class A Common Stock Vested	(63)	$	49.00
Forfeited	(34)	$	67.73
Outstanding, June 30, 2022	234	$	68.86	1.9	$	17,031
Unvested, June 30, 2022	418	$	68.97	1.6	$	30,407

(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 184 shares of Class A common stock currently included in unvested.

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 income (loss), net of tax follows:

	Interest Rate Swaps
Balance, December 31, 2021	$	(5,103)
Other comprehensive income before reclassifications	9,774
Amounts reclassified from accumulated other comprehensive income (loss)	2,122
Income tax provision related to items of other comprehensive income	(2,773)
Net current-period other comprehensive income	9,123
Balance, June 30, 2022	$	4,020

Summary of Reclassifications Out of Accumulated Other Comprehensive Loss

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

	Three Months Ended June 30,				Six Months Ended June 30,
	2022		2021		2022		2021
Details About Accumulated Other Comprehensive Income (Loss), Net of Tax Components	Amounts Reclassified Out of Accumulated Other Comprehensive Income (Loss), Net of Tax								Affected Line Item in the Consolidated Statements of Operations
Interest rate swaps	$	994	$	1,202	$	2,122	$	2,347	Interest expense
	(994)		(1,202)		(2,122)		(2,347)		Income before income taxes
	—		(142)		(190)		(269)		Provision for income taxes
	$	(994)	$	(1,060)	$	(1,932)	$	(2,078)	Net income

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EARNINGS PER SHARE (Tables)

6 Months Ended

Jun. 30, 2022

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,
	2022		2021		2022		2021
Numerator:
Net income	$	17,796	$	11,783	$	21,986	$	16,094
Denominators:
Number of shares outstanding, end of period:
Class A common stock	50,690		50,398		50,690		50,398
Class B common stock	988		988		988		988
Unvested restricted stock	(2)		(2)		(2)		(2)
Effect of weighted average shares outstanding	(34)		(18)		(109)		(111)
Basic weighted average common shares outstanding	51,642		51,366		51,567		51,273
Impact of potentially dilutive securities:
Dilutive effect of stock options and other stock awards	139		180		153		193
Diluted weighted average common shares outstanding	51,781		51,546		51,720		51,466
Anti-dilutive potentially issuable shares	70		—		70		48

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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)

6 Months Ended

Jun. 30, 2022

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, 2022 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	$	1,799	$	—	$	—
Interest rate swaps	—		6,962		—
	$	1,799	$	6,962	$	—

	Fair Value Measurement at December 31, 2021 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	$	2,122	$	—	$	—
Interest rate swaps	—		424		—
	$	2,122	$	424	$	—
Liabilities:
Interest rate swaps	$	—	$	5,176	$	—

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SEGMENT REPORTING (Tables)

6 Months Ended

Jun. 30, 2022

Segment Reporting [Abstract]

Summary of Segment Reporting Information by Segment

Three Months Ended June 30, 2022

Segment	Outside revenues		Inter-company revenues		Depreciation and amortization		Operating income (loss)		Total assets
Eastern	$	87,263	$	22,147	$	11,538	$	6,150	$	362,942
Western	114,884		39,491		15,939		19,897		697,252
Resource Solutions	81,519		317		3,110		6,235		189,820
Corporate entities	—		—		563		(563)		120,705
Eliminations	—		(61,955)		—		—		—
	$	283,666	$	—	$	31,150	$	31,719	$	1,370,719

Three Months Ended June 30, 2021

Segment	Outside revenues		Inter-company revenues		Depreciation and amortization		Operating income (loss)		Total assets
Eastern	$	61,058	$	16,128	$	7,313	$	3,781	$	226,157
Western	98,852		33,566		15,089		14,900		654,314
Resource Solutions	55,965		1,277		1,548		3,651		95,664
Corporate entities	—		—		387		(386)		251,698
Eliminations	—		(50,971)		—		—		—
	$	215,875	$	—	$	24,337	$	21,946	$	1,227,833

Six Months Ended June 30, 2022

Segment	Outside revenues		Inter-company revenues		Depreciation and amortization		Operating income (loss)		Total assets
Eastern	$	158,582	$	38,815	$	22,988	$	3,920	$	362,942
Western	210,723		71,983		30,598		29,160		697,252
Resource Solutions	148,388		1,095		5,872		9,928		189,820
Corporate Entities	—		—		1,121		(1,121)		120,705
Eliminations	—		(111,893)		—		—		—
Total	$	517,693	$	—	$	60,579	$	41,887	$	1,370,719

Six Months Ended June 30, 2021

Segment	Outside revenues		Inter-company revenues		Depreciation and amortization		Operating income (loss)		Total assets
Eastern	$	113,403	$	28,554	$	13,935	$	6,027	$	226,157
Western	184,616		62,248		29,128		22,657		654,314
Resource Solutions	107,387		3,180		3,116		6,113		95,664
Corporate Entities	—		—		840		(842)		251,698
Eliminations	—		(93,982)		—		—		—
Total	$	405,406	$	—	$	47,019	$	33,955	$	1,227,833

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,
	2022		2021		2022		2021
Collection	$	137,261	$	107,327	$	256,793	$	204,796
Disposal	60,204		49,173		103,356		87,026
Power generation	1,753		1,100		4,407		2,403
Processing	2,929		2,310		4,749		3,794
Solid waste operations	202,147		159,910		369,305		298,019
Processing	33,867		21,031		61,263		38,302
Non-processing	47,652		34,934		87,125		69,085
Resource Solutions operations	81,519		55,965		148,388		107,387
Total revenues	$	283,666	$	215,875	$	517,693	$	405,406

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BASIS OF PRESENTATION (Details)	6 Months Ended
	Jun. 30, 2022 regionalOperatingSegment
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of regional operating segments	2

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REVENUE RECOGNITION - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Total revenues	$ 283,666	$ 215,875	$ 517,693	$ 405,406
Collection
Disaggregation of Revenue [Line Items]
Total revenues	137,261	107,327	256,793	204,796
Landfill
Disaggregation of Revenue [Line Items]
Total revenues	25,141	22,635	44,706	41,656
Transfer
Disaggregation of Revenue [Line Items]
Total revenues	29,274	23,451	48,730	40,022
Transportation
Disaggregation of Revenue [Line Items]
Total revenues	5,789	3,087	9,920	5,348
Landfill gas-to-energy
Disaggregation of Revenue [Line Items]
Total revenues	1,753	1,100	4,407	2,403
Processing
Disaggregation of Revenue [Line Items]
Total revenues	36,796	23,341	66,012	42,096
Non-processing
Disaggregation of Revenue [Line Items]
Total revenues	47,652	34,934	87,125	69,085
Transferred at a point-in-time
Disaggregation of Revenue [Line Items]
Total revenues	19,447	15,469	35,164	26,106
Transferred over time
Disaggregation of Revenue [Line Items]
Total revenues	264,219	200,406	482,529	379,300
Eastern
Disaggregation of Revenue [Line Items]
Total revenues	87,263	61,058	158,582	113,403
Eastern | Collection
Disaggregation of Revenue [Line Items]
Total revenues	59,299	39,364	110,796	75,440
Eastern | Landfill
Disaggregation of Revenue [Line Items]
Total revenues	6,542	6,118	11,918	11,520
Eastern | Transfer
Disaggregation of Revenue [Line Items]
Total revenues	17,292	13,475	28,905	22,899
Eastern | Transportation
Disaggregation of Revenue [Line Items]
Total revenues	1,765	47	3,238	95
Eastern | Landfill gas-to-energy
Disaggregation of Revenue [Line Items]
Total revenues	249	246	522	515
Eastern | Processing
Disaggregation of Revenue [Line Items]
Total revenues	2,116	1,808	3,203	2,934
Eastern | Non-processing
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Eastern | Transferred at a point-in-time
Disaggregation of Revenue [Line Items]
Total revenues	117	38	236	82
Eastern | Transferred over time
Disaggregation of Revenue [Line Items]
Total revenues	87,146	61,020	158,346	113,321
Western
Disaggregation of Revenue [Line Items]
Total revenues	114,884	98,852	210,723	184,616
Western | Collection
Disaggregation of Revenue [Line Items]
Total revenues	77,962	67,963	145,997	129,356
Western | Landfill
Disaggregation of Revenue [Line Items]
Total revenues	18,599	16,517	32,788	30,136
Western | Transfer
Disaggregation of Revenue [Line Items]
Total revenues	11,982	9,976	19,825	17,123
Western | Transportation
Disaggregation of Revenue [Line Items]
Total revenues	4,024	3,040	6,682	5,253
Western | Landfill gas-to-energy
Disaggregation of Revenue [Line Items]
Total revenues	1,504	854	3,885	1,888
Western | Processing
Disaggregation of Revenue [Line Items]
Total revenues	813	502	1,546	860
Western | Non-processing
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0	0
Western | Transferred at a point-in-time
Disaggregation of Revenue [Line Items]
Total revenues	517	487	1,028	988
Western | Transferred over time
Disaggregation of Revenue [Line Items]
Total revenues	114,367	98,365	209,695	183,628
Resource Solutions
Disaggregation of Revenue [Line Items]
Total revenues	81,519	55,965	148,388	107,387
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 | 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
Resource Solutions | Processing
Disaggregation of Revenue [Line Items]
Total revenues	33,867	21,031	61,263	38,302
Resource Solutions | Non-processing
Disaggregation of Revenue [Line Items]
Total revenues	47,652	34,934	87,125	69,085
Resource Solutions | Transferred at a point-in-time
Disaggregation of Revenue [Line Items]
Total revenues	18,813	14,944	33,900	25,036
Resource Solutions | Transferred over time
Disaggregation of Revenue [Line Items]
Total revenues	$ 62,706	$ 41,021	$ 114,488	$ 82,351

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REVENUE RECOGNITION - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Rebates	$ (283,666,000)	$ (215,875,000)	$ (517,693,000)	$ (405,406,000)
Revenue recognized fro performance obligation satisfied in previous period	0	0	0	0
Gross receivables from contracts	111,601,000		111,601,000		$ 89,232,000
Contract liabilities	3,733,000		3,733,000		$ 3,404,000
Rebate for Recycled or Returned Organic Materials
Disaggregation of Revenue [Line Items]
Rebates	$ 5,908,000	$ 2,532,000	$ 9,702,000	$ 4,100,000

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BUSINESS COMBINATIONS - Narrative (Details) - business	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Minimum
Business Acquisition [Line Items]
Useful life of finite lived intangible assets (in years)	4 years
Maximum
Business Acquisition [Line Items]
Useful life of finite lived intangible assets (in years)	10 years
Western | Tuck-in Solid Waste Collection Business
Business Acquisition [Line Items]
Number of businesses acquired	4	2

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BUSINESS COMBINATIONS - Summary of Purchase Price Paid for Acquisitions (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Purchase Price:
Cash used in acquisitions, net of cash acquired	$ 56,250	$ 5,481
Allocated as follows:
Excess purchase price allocated to goodwill	262,508		$ 232,860
Waste Collection Acquisitions
Purchase Price:
Cash used in acquisitions, net of cash acquired	55,053	4,378
Holdbacks	3,842	505
Total consideration	58,895	4,883
Allocated as follows:
Current assets	7,584	13
Land	2,804	0
Buildings and improvements	5,308	0
Equipment	6,712	1,549
Operating lease right-of-use assets	405	0
Other non-current assets	40	0
Current liabilities	(3,577)	(82)
Operating lease liabilities, less current portion	(282)	0
Fair value of assets acquired and liabilities assumed	30,134	3,126
Excess purchase price allocated to goodwill	28,761	1,757
Waste Collection Acquisitions | Covenants not-to-compete
Allocated as follows:
Intangible assets:	1,415	420
Waste Collection Acquisitions | Customer Relationships
Allocated as follows:
Intangible assets:	$ 9,725	$ 1,226

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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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Business Combination and Asset Acquisition [Abstract]
Revenues	$ 284,314	$ 246,623	$ 525,012	$ 467,326
Operating income	31,776	22,612	42,716	35,334
Net income	$ 17,787	$ 9,952	$ 22,025	$ 12,457
Weighted average common shares outstanding, basic (in shares)	51,642	51,366	51,567	51,273
Basic earnings per common share (in dollars per share)	$ 0.34	$ 0.19	$ 0.43	$ 0.24
Weighted average common shares outstanding, diluted (in shares)	51,781	51,546	51,720	51,466
Diluted earnings per common share (in dollars per share)	$ 0.34	$ 0.19	$ 0.43	$ 0.24

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GOODWILL AND INTANGIBLE ASSETS - Summary of Goodwill Activity (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2022 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 232,860
Acquisitions	28,761
Adjustments to Acquisitions	887
Goodwill, ending balance	262,508
Eastern
Goodwill [Roll Forward]
Goodwill, beginning balance	52,072
Acquisitions	93
Adjustments to Acquisitions	237
Goodwill, ending balance	52,402
Western
Goodwill [Roll Forward]
Goodwill, beginning balance	163,728
Acquisitions	7,350
Adjustments to Acquisitions	650
Goodwill, ending balance	171,728
Resource Solutions
Goodwill [Roll Forward]
Goodwill, beginning balance	17,060
Acquisitions	21,318
Adjustments to Acquisitions	0
Goodwill, ending balance	$ 38,378

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GOODWILL AND INTANGIBLE ASSETS - Summary of Intangible Assets by Type (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 163,223	$ 152,132
Less accumulated amortization	(66,461)	(58,409)
Intangible assets, net	96,762	93,723
Covenants not-to-compete
Finite-Lived Intangible Assets [Line Items]
Intangible assets	30,193	28,777
Less accumulated amortization	(23,094)	(22,148)
Intangible assets, net	7,099	6,629
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets	124,680	115,005
Less accumulated amortization	(40,296)	(34,809)
Intangible assets, net	84,384	80,196
Trade Names
Finite-Lived Intangible Assets [Line Items]
Intangible assets	8,350	8,350
Less accumulated amortization	(3,071)	(1,452)
Intangible assets, net	$ 5,279	$ 6,898

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GOODWILL AND INTANGIBLE ASSETS - Narrative (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible amortization expense	$ 4,262	$ 2,015	$ 8,052	$ 4,043

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GOODWILL AND INTANGIBLE ASSETS - Summary of Intangible Amortization Expense Estimated (Detail) $ in Thousands	Jun. 30, 2022 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Fiscal year ending December 31, 2022	$ 8,158
Fiscal year ending December 31, 2023	15,600
Fiscal year ending December 31, 2024	14,879
Fiscal year ending December 31, 2025	13,758
Fiscal year ending December 31, 2026	12,123
Thereafter	$ 32,244

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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, 2022	Jun. 30, 2021
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance	$ 86,914	$ 82,533
Obligations incurred	2,244	2,319
Revision in estimates	1,443	0
Accretion expense	3,799	3,676
Obligations settled	(2,027)	(2,969)
Ending balance	$ 92,373	$ 85,559

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DEBT - Summary of Debt (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Weighted-average discount rate - finance leases	3.60%
Finance leases maturing through December 2107; bearing interest at a weighted average of 3.6%	$ 45,889	$ 45,724
Principal amount of debt	593,662	562,570
Less - unamortized debt issuance costs	10,470	10,166
Debt less unamortized debt issuance costs	583,192	552,404
Less—current maturities of debt	7,636	9,901
Debt, less current portion	575,556	542,503
Secured Debt | Term loan A facility ("Term Loan Facility") due December 2026; bearing interest at LIBOR plus 1.375%
Debt Instrument [Line Items]
Principal amount of debt	$ 350,000	350,000
Secured Debt | Term loan A facility ("Term Loan Facility") due December 2026; bearing interest at LIBOR plus 1.375% | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	1.375%
Line of Credit | Revolving credit facility due December 2026 ("Revolving Credit Facility"); bearing interest at LIBOR plus 1.375%
Debt Instrument [Line Items]
Principal amount of debt	$ 0	0
Line of Credit | Revolving credit facility due December 2026 ("Revolving Credit Facility"); bearing interest at LIBOR plus 1.375% | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (as a percent)	1.375%
Credit Facility | Revolving Credit Facility and Term Loan Facility (collectively, the "Credit Facility")
Debt Instrument [Line Items]
Less - unamortized debt issuance costs	$ 5,306	5,884
Unsecured Debt | New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014 ("New York Bonds 2014R-1") due December 2044 - fixed rate interest period through 2029; bearing interest at 2.875%
Debt Instrument [Line Items]
Stated interest rate	2.875%
Principal amount of debt	$ 25,000	25,000
Less - unamortized debt issuance costs	$ 899	933
Unsecured Debt | 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]
Stated interest rate	3.125%
Principal amount of debt	$ 15,000	15,000
Less - unamortized debt issuance costs	$ 238	268
Unsecured Debt | New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2020 ("New York Bonds 2020") due September 2050 - fixed rate interest period through 2025; bearing interest at 2.750%
Debt Instrument [Line Items]
Stated interest rate	2.75%
Principal amount of debt	$ 40,000	40,000
Less - unamortized debt issuance costs	$ 1,194	1,283
Unsecured Debt | 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]
Stated interest rate	5.25%
Principal amount of debt	$ 25,000	25,000
Less - unamortized debt issuance costs	$ 219	262
Unsecured Debt | 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]
Stated interest rate	5.125%
Principal amount of debt	$ 15,000	15,000
Less - unamortized debt issuance costs	$ 378	413
Unsecured Debt | 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]
Stated interest rate	4.375%
Principal amount of debt	$ 15,000	15,000
Less - unamortized debt issuance costs	$ 231	268
Unsecured Debt | Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2013 ("Vermont Bonds 2013") due April 2036 - fixed rate interest period through 2028; bearing interest at 4.625%
Debt Instrument [Line Items]
Stated interest rate	4.625%
Principal amount of debt	$ 16,000	16,000
Less - unamortized debt issuance costs	$ 405	433
Unsecured Debt | Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2022A-1 ("Vermont Bonds 2022A-1") due June 2052 - fixed rate interest period through 2027; bearing interest at 5.00%
Debt Instrument [Line Items]
Stated interest rate	5.00%
Principal amount of debt	$ 35,000	0
Less - unamortized debt issuance costs	$ 1,207	0
Unsecured Debt | 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]
Stated interest rate	2.95%
Principal amount of debt	$ 11,000	11,000
Less - unamortized debt issuance costs	$ 393	422
Notes payable maturing through August 2024; bearing interest at a weighted average of 1.6%
Debt Instrument [Line Items]
Weighted average interest rate	1.60%
Principal amount of debt	$ 773	$ 4,846

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DEBT - Financing Activities and Credit Facility Narrative (Details)	6 Months Ended
	Jun. 30, 2022 USD ($)
Debt Instrument [Line Items]
Additional borrowing capacity	$ 125,000,000
Line of Credit
Debt Instrument [Line Items]
Debt instrument, term (in years)	5 years
Net leverage ratio	2.25
Line of credit facility, remaining borrowing capacity	$ 271,805,000
Line of credit, amount drawn	$ 0
Line of Credit | LIBOR | Maximum
Debt Instrument [Line Items]
Floor interest rate received (as a percent)	1.375%
Line of Credit | LIBOR | Minimum
Debt Instrument [Line Items]
Floor interest rate received (as a percent)	1.125%
Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2022A-1 ("Vermont Bonds 2022A-1") due June 2052 - fixed rate interest period through 2027; bearing interest at 5.00% | Unsecured Debt
Debt Instrument [Line Items]
Aggregate principal amount	$ 35,000,000
Stated interest rate	5.00%
Restricted cash	$ 1,006,000
Term loan A facility ("Term Loan Facility") due December 2026; bearing interest at LIBOR plus 1.375% | Secured Debt
Debt Instrument [Line Items]
Aggregate principal amount	350,000,000
Revolving credit facility due December 2026 ("Revolving Credit Facility"); bearing interest at LIBOR plus 1.375% | Revolving Credit Facility | Line of Credit
Debt Instrument [Line Items]
Credit facility maximum	300,000,000
Letters of credit outstanding	28,195,000
Revolving credit facility due December 2026 ("Revolving Credit Facility"); bearing interest at LIBOR plus 1.375% | Revolving Credit Facility | Letter of Credit
Debt Instrument [Line Items]
Letters of credit sublimit	$ 75,000,000

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DEBT - Cash Flow Hedges Narrative (Details) - Cash Flow Hedging - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Interest Rate Derivative
Debt Instrument [Line Items]
Notional amount	$ 190,000	$ 195,000
Floor interest rate (as a percent)	0.00%
Weighted average percentage rate paid (as a percent)	2.20%
Forward Starting Interest Rate Derivative
Debt Instrument [Line Items]
Notional amount	$ 20,000	$ 85,000
Floor interest rate (as a percent)	0.00%
Weighted average percentage rate paid (as a percent)	1.29%

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DEBT - Summary of Cash Flow Hedges (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Accumulated other comprehensive income (loss), net of tax	$ 4,020	$ (5,103)
Designated as Hedging Instrument | Interest rate swaps
Derivatives, Fair Value [Line Items]
Cash flow hedge derivatives, gross asset	6,962	424
Cash flow hedge derivatives, gross liability	0	5,176
Designated as Hedging Instrument | Interest rate swaps | Accumulated gain (loss), cash flow hedge
Derivatives, Fair Value [Line Items]
Accumulated other comprehensive income (loss), before tax	6,962	(4,935)
Accumulated other comprehensive income (loss), tax	(2,942)	(168)
Accumulated other comprehensive income (loss), net of tax	4,020	(5,103)
Other current assets | Designated as Hedging Instrument | Interest rate swaps
Derivatives, Fair Value [Line Items]
Cash flow hedge derivatives, gross asset	1,454	0
Other non-current assets | Designated as Hedging Instrument | Interest rate swaps
Derivatives, Fair Value [Line Items]
Cash flow hedge derivatives, gross asset	5,508	424
Other accrued liabilities | Designated as Hedging Instrument | Interest rate swaps
Derivatives, Fair Value [Line Items]
Cash flow hedge derivatives, gross liability	0	3,796
Other long-term liabilities | Designated as Hedging Instrument | Interest rate swaps
Derivatives, Fair Value [Line Items]
Cash flow hedge derivatives, gross liability	$ 0	$ 1,380

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DEBT - Schedule of Loss On Cash Flow Hedges (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Other comprehensive loss, reclassification adjustment from AOCI	$ 994	$ 1,202	$ 2,122	$ 2,347
Interest rate swaps | Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Other comprehensive loss, reclassification adjustment from AOCI	$ 994	$ 1,202	$ 2,122	$ 2,347

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COMMITMENTS AND CONTINGENCIES - Narrative (Detail) $ in Thousands	Jun. 30, 2022 USD ($)
Loss Contingencies [Line Items]
Loss contingency accrual	$ 1,291
Minimum
Loss Contingencies [Line Items]
Risk free interest (as a percent)	1.50%
Maximum
Loss Contingencies [Line Items]
Risk free interest (as a percent)	2.60%

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COMMITMENTS AND CONTINGENCIES - Environmental Remediation Liability (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning balance	$ 5,887	$ 5,200
Accretion expense	54	56
Obligations settled	(72)	(281)
Ending balance	5,869	4,975
Less: current portion	280	375
Long-term portion	$ 5,589	$ 4,600

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STOCKHOLDERS' EQUITY - Narrative (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Limited Partners' Capital Account [Line Items]
Unrecognized stock-based compensation, weighted average period			2 years 1 month 6 days
Fair value of stock awards vested	$ 814,000		$ 5,359,000
Stock Options
Limited Partners' Capital Account [Line Items]
Stock-based compensation expense	17,000	$ 0	33,000	$ 0
Unrecognized stock-based compensation expense, stock options	139,000		139,000
Aggregate intrinsic value of options exercised	1,156,000		1,467,000
Restricted Stock, Restricted Stock Units And Performance Stock Units
Limited Partners' Capital Account [Line Items]
Stock-based compensation expense	828,000	3,044,000	2,979,000	5,928,000
Restricted Stock
Limited Partners' Capital Account [Line Items]
Unrecognized stock-based compensation expense	58,000		$ 58,000
Restricted Stock | Non Employee Director
Limited Partners' Capital Account [Line Items]
Options, vesting period (in years)			3 years
Restricted Stock Unit
Limited Partners' Capital Account [Line Items]
Unrecognized stock-based compensation expense	5,543,000		$ 5,543,000
Performance Stock Unit
Limited Partners' Capital Account [Line Items]
Unrecognized stock-based compensation expense	6,882,000		$ 6,882,000
Weighted average | Restricted Stock
Limited Partners' Capital Account [Line Items]
Unrecognized stock-based compensation, weighted average period			1 year 6 months
Weighted average | Restricted Stock Unit
Limited Partners' Capital Account [Line Items]
Unrecognized stock-based compensation, weighted average period			1 year 10 months 24 days
Weighted average | Performance Stock Unit
Limited Partners' Capital Account [Line Items]
Unrecognized stock-based compensation, weighted average period			1 year 9 months 18 days
2016 Plan
Limited Partners' Capital Account [Line Items]
Options granted, term (in years)			10 years
2016 Plan | Minimum
Limited Partners' Capital Account [Line Items]
Options, vesting period (in years)			1 year
2016 Plan | Maximum
Limited Partners' Capital Account [Line Items]
Options, vesting period (in years)			4 years
Amended and Restated 1997 Employee Stock Purchase Plan
Limited Partners' Capital Account [Line Items]
Stock-based compensation expense	$ 93,000	$ 72,000	$ 166,000	$ 128,000
Class A Common Stock | 2016 Plan
Limited Partners' Capital Account [Line Items]
Common stock, authorized shares (in shares)	2,250,000		2,250,000
Number of shares available for future grant (in shares)	868,000		868,000
Class A Common Stock | 2006 Incentive Plan
Limited Partners' Capital Account [Line Items]
Common stock, additional authorized shares (in shares)			2,723,000

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STOCKHOLDERS' EQUITY - Summary of Stock Option Activity (Detail) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2022 USD ($) $ / shares shares
Stock Options
Beginning balance, outstanding (in shares) | shares	77
Granted (in shares) | shares	0
Exercised (in shares) | shares	(23)
Forfeited (in shares) | shares	0
Ending balance, outstanding (in shares) | shares	54
Exercisable at end of period (in shares) | shares	46
Weighted Average Exercise Price
Beginning balance, outstanding (in dollars per share) | $ / shares	$ 15.68
Granted (in dollars per share) | $ / shares	0
Exercised (in dollars per share) | $ / shares	8.56
Forfeited (in dollars per share) | $ / shares	0
Ending balance, outstanding (in dollars per share) | $ / shares	18.62
Exercisable at end of period (in dollars per share) | $ / shares	$ 9.49
Weighted Average Remaining Contractual Term (years) and Aggregate Intrinsic Value
Outstanding contractual term	4 years 3 months 18 days
Exercisable contractual term	3 years 6 months
Outstanding aggregate intrinsic value | $	$ 2,946
Exercisable aggregate intrinsic value | $	$ 2,913

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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, 2022 USD ($) $ / shares shares
Performance Stock Unit
Weighted Average Remaining Contractual Term (years) and Aggregate Intrinsic Value
Percentage of attainment level (as a percent)	100.00%
Performance Stock Unit | Class A Common Stock
Weighted Average Remaining Contractual Term (years) and Aggregate Intrinsic Value
Number of additional shares (in shares)	184
Restricted Stock, Restricted Stock Units And Performance Stock Units
Restricted Stock, Restricted Stock Units, and Performance Stock Units
Outstanding, beginning of period (in shares)	249
Granted (in shares)	82
Forfeited (in shares)	(34)
Outstanding, end of period (in shares)	234
Weighted Average Grant Date Fair Value
Outstanding at beginning of period (in dollars per share) | $ / shares	$ 55.40
Granted (in dollars per share) | $ / shares	94.31
Forfeited (in dollars per share) | $ / shares	67.73
Outstanding at end of period (in dollars per share) | $ / shares	$ 68.86
Weighted Average Remaining Contractual Term (years) and Aggregate Intrinsic Value
Contractual term (in years)	1 year 10 months 24 days
Aggregate intrinsic value | $	$ 17,031
Restricted Stock, Restricted Stock Units And Performance Stock Units | Class A Common Stock
Restricted Stock, Restricted Stock Units, and Performance Stock Units
Vested (in shares)	(63)
Weighted Average Grant Date Fair Value
Class A Common Stock Vested (in dollars per share) | $ / shares	$ 49.00
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)	418
Weighted Average Grant Date Fair Value
Outstanding at end of period (in dollars per share) | $ / shares	$ 68.97
Weighted Average Remaining Contractual Term (years) and Aggregate Intrinsic Value
Contractual term (in years)	1 year 7 months 6 days
Aggregate intrinsic value | $	$ 30,407

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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, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 435,050	$ 422,457	$ 373,336	$ 362,142	$ 422,457	$ 362,142
Other comprehensive income (loss), net of tax	2,980	6,143	(235)	3,830	9,123	3,595
Ending balance	457,566	435,050	$ 388,492	$ 373,336	457,566	$ 388,492
Accumulated Gain (Loss), Cash Flow Hedge
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		$ (5,103)			(5,103)
Other comprehensive income					9,774
Amounts reclassified from accumulated other comprehensive income (loss)					2,122
Income tax provision related to items of other comprehensive income					(2,773)
Other comprehensive income (loss), net of tax					9,123
Ending balance	$ 4,020				$ 4,020

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STOCKHOLDERS' EQUITY - Summary of Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ 5,698		$ 5,296		$ 10,902	$ 10,764
Income before income taxes	26,375		17,226		31,523	23,969
Provision for income taxes	8,579		5,443		9,537	7,875
Net income	17,796	$ 4,190	11,783	$ 4,311	21,986	16,094
Accumulated Gain (Loss), Cash Flow Hedge | Amounts Reclassified Out of Accumulated Other Comprehensive Income (Loss), Net of Tax
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income before income taxes	(994)		(1,202)		(2,122)	(2,347)
Provision for income taxes	0		(142)		(190)	(269)
Net income	(994)		(1,060)		(1,932)	(2,078)
Interest rate swaps | Accumulated Gain (Loss), Cash Flow Hedge | Amounts Reclassified Out of Accumulated Other Comprehensive Income (Loss), Net of Tax
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ 994		$ 1,202		$ 2,122	$ 2,347

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EARNINGS PER SHARE (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Numerator:
Net income	$ 17,796	$ 11,783	$ 21,986	$ 16,094
Denominators:
Unvested restricted stock (in shares)	(2,000)	(2,000)	(2,000)	(2,000)
Effect of weighted average shares outstanding (in shares)	(34,000)	(18,000)	(109,000)	(111,000)
Weighted average common shares outstanding, basic (in shares)	51,642,000	51,366,000	51,567,000	51,273,000
Impact of potentially dilutive securities:
Dilutive effect of stock options and other stock awards (in shares)	139,000	180,000	153,000	193,000
Weighted average common shares outstanding, diluted	51,781,000	51,546,000	51,720,000	51,466,000
Anti-dilutive potentially issuable shares (in shares)	70,000	0	70,000	48,000
Class A Common Stock
Denominators:
Common stock, shares outstanding (in shares)	50,690,000	50,398,000	50,690,000	50,398,000	50,423,000
Class B Common Stock
Denominators:
Common stock, shares outstanding (in shares)	988,000	988,000	988,000	988,000	988,000

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OTHER ITEMS AND CHARGES (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Unusual or Infrequent Items, or Both [Abstract]
Expense from acquisition activities	$ 1,019	$ 1,632	$ 3,062	$ 2,046

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FAIR VALUE OF FINANCIAL INSTRUMENTS - Recurring Fair Value Measurements (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Assets:
Restricted investment securities - landfill closure	$ 2,805	$ 2,122
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Interest rate swaps	0	0
Total assets	1,799	2,122
Liabilities:
Interest rate swaps		0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Landfill
Assets:
Restricted investment securities - landfill closure	1,799	2,122
Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Interest rate swaps	6,962	424
Total assets	6,962	424
Liabilities:
Interest rate swaps		5,176
Recurring | Significant Other Observable Inputs (Level 2) | Landfill
Assets:
Restricted investment securities - landfill closure	0	0
Recurring | Significant Unobservable Inputs (Level 3)
Assets:
Interest rate swaps	0	0
Total assets	0	0
Liabilities:
Interest rate swaps		0
Recurring | Significant Unobservable Inputs (Level 3) | Landfill
Assets:
Restricted investment securities - landfill closure	$ 0	$ 0

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FAIR VALUE OF FINANCIAL INSTRUMENTS - Additional Information (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Term loan A facility ("Term Loan Facility") due December 2026; bearing interest at LIBOR plus 1.375% | Secured Debt
Debt Instrument [Line Items]
Principal amount of debt	$ 350,000	$ 350,000
Fair Value | Fixed Rate Bonds
Debt Instrument [Line Items]
Fixed rate debt	189,558
Carrying Value
Debt Instrument [Line Items]
Revolving credit facility	0
Carrying Value | Fixed Rate Bonds
Debt Instrument [Line Items]
Fixed rate debt	$ 197,000

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SEGMENT REPORTING - Summary of Financial Information by Reportable Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Segment Reporting Information [Line Items]
Revenues	$ 283,666	$ 215,875	$ 517,693	$ 405,406
Depreciation and amortization	31,150	24,337	60,579	47,019
Operating income (loss)	31,719	21,946	41,887	33,955
Total assets	1,370,719	1,227,833	1,370,719	1,227,833	$ 1,283,580
Operating | Eastern
Segment Reporting Information [Line Items]
Revenues	87,263	61,058	158,582	113,403
Depreciation and amortization	11,538	7,313	22,988	13,935
Operating income (loss)	6,150	3,781	3,920	6,027
Total assets	362,942	226,157	362,942	226,157
Operating | Western
Segment Reporting Information [Line Items]
Revenues	114,884	98,852	210,723	184,616
Depreciation and amortization	15,939	15,089	30,598	29,128
Operating income (loss)	19,897	14,900	29,160	22,657
Total assets	697,252	654,314	697,252	654,314
Operating | Resource Solutions
Segment Reporting Information [Line Items]
Revenues	81,519	55,965	148,388	107,387
Depreciation and amortization	3,110	1,548	5,872	3,116
Operating income (loss)	6,235	3,651	9,928	6,113
Total assets	189,820	95,664	189,820	95,664
Corporate entities
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Depreciation and amortization	563	387	1,121	840
Operating income (loss)	(563)	(386)	(1,121)	(842)
Total assets	120,705	251,698	120,705	251,698
Inter-company revenues
Segment Reporting Information [Line Items]
Revenues	(61,955)	(50,971)	(111,893)	(93,982)
Inter-company revenues | Eastern
Segment Reporting Information [Line Items]
Revenues	(22,147)	(16,128)	(38,815)	(28,554)
Inter-company revenues | Western
Segment Reporting Information [Line Items]
Revenues	(39,491)	(33,566)	(71,983)	(62,248)
Inter-company revenues | Resource Solutions
Segment Reporting Information [Line Items]
Revenues	$ (317)	$ (1,277)	$ (1,095)	$ (3,180)

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SEGMENT REPORTING - Summary of Revenues Attributable to Services Provided by Company (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue from External Customer [Line Items]
Revenues	$ 283,666	$ 215,875	$ 517,693	$ 405,406
Solid waste operations
Revenue from External Customer [Line Items]
Revenues	202,147	159,910	369,305	298,019
Collection
Revenue from External Customer [Line Items]
Revenues	137,261	107,327	256,793	204,796
Disposal
Revenue from External Customer [Line Items]
Revenues	60,204	49,173	103,356	87,026
Power generation
Revenue from External Customer [Line Items]
Revenues	1,753	1,100	4,407	2,403
Processing
Revenue from External Customer [Line Items]
Revenues	2,929	2,310	4,749	3,794
Resource Solutions operations
Revenue from External Customer [Line Items]
Revenues	81,519	55,965	148,388	107,387
Processing
Revenue from External Customer [Line Items]
Revenues	33,867	21,031	61,263	38,302
Non-processing
Revenue from External Customer [Line Items]
Revenues	$ 47,652	$ 34,934	$ 87,125	$ 69,085