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 September 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 October 15, 2022:

Class A common stock, $0.01 par value per share:	50,692,053
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)

	September 30, 2022		December 31, 2021
	(Unaudited)
ASSETS
CURRENT ASSETS:
Cash and cash equivalents	$	47,934	$	33,809
Accounts receivable, net of allowance for credit losses of $4,265 and $3,276, respectively	108,010		86,979
Prepaid expenses	14,998		12,766
Inventory	13,432		9,729
Other current assets	7,109		3,196
Total current assets	191,483		146,479
Property, plant and equipment, net of accumulated depreciation and amortization of $1,038,576 and $973,094, respectively	685,348		644,604
Operating lease right-of-use assets	93,066		93,799
Goodwill	272,442		232,860
Intangible assets, net	94,792		93,723
Restricted assets	1,705		2,122
Cost method investments	10,967		11,264
Deferred income taxes	25,549		43,957
Other non-current assets	23,995		14,772
Total assets	$	1,399,347	$	1,283,580

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

1

CASELLA WASTE SYSTEMS, INC. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS (Continued)

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

	September 30, 2022		December 31, 2021
	(Unaudited)
LIABILITIES AND STOCKHOLDERS' EQUITY
CURRENT LIABILITIES:
Current maturities of debt	$	8,337	$	9,901
Current operating lease liabilities	6,898		7,307
Accounts payable	71,074		63,086
Accrued payroll and related expenses	20,056		22,210
Accrued interest	2,956		2,042
Contract liabilities	3,891		3,404
Current accrued final capping, closure and post-closure costs	10,880		7,915
Other accrued liabilities	38,740		36,328
Total current liabilities	162,832		152,193
Debt, less current portion	578,462		542,503
Operating lease liabilities, less current portion	58,528		56,375
Accrued final capping, closure and post-closure costs, less current portion	83,727		78,999
Deferred income taxes	522		868
Other long-term liabilities	28,717		30,185
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' EQUITY:
Class A common stock, $0.01 par value per share; 100,000,000 shares authorized; 50,692,000 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	658,453		652,045
Accumulated deficit	(180,341)		(224,999)
Accumulated other comprehensive income (loss), net of tax	7,930		(5,103)
Total stockholders' equity	486,559		422,457
Total liabilities and stockholders' equity	$	1,399,347	$	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 September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Revenues	$	295,268	$	241,969	$	812,962	$	647,375
Operating expenses:
Cost of operations	190,285		153,892		538,779		419,583
General and administration	34,348		30,993		97,702		87,336
Depreciation and amortization	32,527		27,491		93,106		74,510
Expense from acquisition activities	816		1,904		3,878		3,950
Environmental remediation charge	759		—		759		—
Southbridge Landfill closure charge	245		302		563		653
	258,980		214,582		734,787		586,032
Operating income	36,288		27,387		78,175		61,343
Other expense (income):
Interest income	(178)		(61)		(260)		(191)
Interest expense	6,177		5,164		17,078		15,928
Other income	(1,523)		(178)		(1,978)		(825)
Other expense, net	4,476		4,925		14,840		14,912
Income before income taxes	31,812		22,462		63,335		46,431
Provision for income taxes	9,140		6,601		18,677		14,476
Net income	$	22,672	$	15,861	$	44,658	$	31,955
Basic earnings per share attributable to common stockholders:
Weighted average common shares outstanding	51,677		51,389		51,604		51,312
Basic earnings per common share	$	0.44	$	0.31	$	0.87	$	0.62
Diluted earnings per share attributable to common stockholders:
Weighted average common shares outstanding	51,806		51,586		51,749		51,506
Diluted earnings per common share	$	0.44	$	0.31	$	0.86	$	0.62

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

3

CASELLA WASTE SYSTEMS, INC. AND SUBSIDIARIES

UNAUDITED CONSOLIDATED STATEMENTS OF

COMPREHENSIVE INCOME

(in thousands)

	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Net income	$	22,672	$	15,861	$	44,658	$	31,955
Other comprehensive income (loss), before tax:
Hedging activity:
Interest rate swap settlements	(129)		(1,205)		(2,224)		(3,551)
Interest rate swap amounts reclassified into interest expense	14		1,204		2,136		3,551
Unrealized gain resulting from changes in fair value of derivative instruments	5,493		1,215		17,362		5,866
Other comprehensive income, before tax	5,378		1,214		17,274		5,866
Income tax provision related to items of other comprehensive income	1,468		322		4,241		1,379
Other comprehensive income, net of tax	3,910		892		13,033		4,487
Comprehensive income	$	26,582	$	16,753	$	57,691	$	36,442

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

4

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
Issuances of Class A common stock	—		2	—		—	—		—		—		—
Stock-based compensation	2,411		—	—		—	—		2,411		—		—
Comprehensive income:
Net income	22,672		—	—		—	—		—		22,672		—
Other comprehensive income:
Hedging activity	3,910		—	—		—	—		—		—		3,910
Balance, September 30, 2022	$	486,559	50,692	$	507	988	$	10	$	658,453	$	(180,341)	$	7,930

5

CASELLA WASTE SYSTEMS, INC. AND SUBSIDIARIES

UNAUDITED CONSOLIDATED STATEMENTS OF

STOCKHOLDERS' EQUITY (Continued)

(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 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)
Issuances of Class A common stock	51		12	—		—	—		51		—		—
Stock-based compensation	2,655		—	—		—	—		2,655		—		—
Comprehensive income:
Net income	15,861		—	—		—	—		—		15,861		—
Other comprehensive income:
Hedging activity	892		—	—		—	—		—		—		892
Balance, September 30, 2021	$	407,951	50,410	$	504	988	$	10	$	648,611	$	(234,144)	$	(7,030)

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

6

CASELLA WASTE SYSTEMS, INC. AND SUBSIDIARIES

UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)

	Nine Months Ended September 30,
	2022		2021
Cash Flows from Operating Activities:
Net income	$	44,658	$	31,955
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	93,106		74,510
Interest accretion on landfill and environmental remediation liabilities	6,018		5,915
Amortization of debt issuance costs	1,414		1,716
Stock-based compensation	5,589		8,712
Operating lease right-of-use assets expense	10,405		9,981
Gain on sale of property and equipment	(580)		—
Non-cash expense from acquisition activities	298		532
Deferred income taxes	13,819		12,974
Changes in assets and liabilities, net of effects of acquisitions and divestitures:
Accounts receivable	(14,230)		(10,943)
Landfill operating lease contract expenditures	(3,336)		(3,646)
Accounts payable	7,946		20,318
Prepaid expenses, inventories and other assets	(5,799)		(14,391)
Accrued expenses, contract liabilities and other liabilities	(6,877)		(3,544)
Net cash provided by operating activities	152,431		134,089
Cash Flows from Investing Activities:
Acquisitions, net of cash acquired	(73,963)		(153,112)
Additions to property, plant and equipment	(87,667)		(81,577)
Proceeds from sale of property and equipment	571		593
Net cash used in investing activities	(161,059)		(234,096)
Cash Flows from Financing Activities:
Proceeds from debt borrowings	82,200		500
Principal payments on debt	(57,407)		(8,517)
Payments of debt issuance costs	(1,232)		—
Payments of contingent consideration	(1,000)		—
Proceeds from the exercise of share based awards	192		163
Net cash provided by (used in) financing activities	22,753		(7,854)
Net increase (decrease) in cash and cash equivalents	14,125		(107,861)
Cash and cash equivalents, beginning of period	33,809		154,342
Cash and cash equivalents, end of period	$	47,934	$	46,481
Supplemental Disclosure of Cash Flow Information:
Cash interest payments	$	14,750	$	14,378
Cash income tax payments	$	2,875	$	597
Right-of-use assets obtained in exchange for financing lease obligations	$	9,420	$	18,153
Right-of-use assets obtained in exchange for operating lease obligations	$	7,672	$	3,566

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

7

CASELLA WASTE SYSTEMS, INC. AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

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 nine months ended September 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 September 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.

8

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 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 nine months ended September 30, 2022 and 2021:

9

Three Months Ended September 30, 2022

	Eastern		Western		Resource Solutions		Total Revenues
Collection	$	61,875	$	82,242	$	—	$	144,117
Landfill	7,900		20,240		—		28,140
Transfer station	19,525		13,230		—		32,755
Transportation	1,233		4,019		—		5,252
Landfill gas-to-energy	205		1,438		—		1,643
Processing	2,399		734		32,159		35,292
Non-processing	—		—		48,069		48,069
Total revenues	$	93,137	$	121,903	$	80,228	$	295,268
Transferred at a point-in-time	$	115	$	439	$	12,380	$	12,934
Transferred over time	93,022		121,464		67,848		282,334
Total revenues	$	93,137	$	121,903	$	80,228	$	295,268

Three Months Ended September 30, 2021

	Eastern		Western		Resource Solutions		Total Revenues
Collection	$	48,951	$	69,921	$	—	$	118,872
Landfill	6,622		18,201		—		24,823
Transfer station	16,948		10,375		—		27,323
Transportation	54		3,393		—		3,447
Landfill gas-to-energy	269		984		—		1,253
Processing	2,310		649		27,418		30,377
Non-processing	—		—		35,874		35,874
Total revenues	$	75,154	$	103,523	$	63,292	$	241,969
Transferred at a point-in-time	$	43	$	296	$	19,927	$	20,266
Transferred over time	75,111		103,227		43,365		221,703
Total revenues	$	75,154	$	103,523	$	63,292	$	241,969

Nine Months Ended September 30, 2022

	Eastern		Western		Resource Solutions		Total Revenues
Collection	$	172,671	$	228,239	$	—	$	400,910
Landfill	19,819		53,028		—		72,847
Transfer station	48,431		33,055		—		81,486
Transportation	4,470		10,700		—		15,170
Landfill gas-to-energy	727		5,323		—		6,050
Processing	5,602		2,281		93,421		101,304
Non-processing	—		—		135,195		135,195
Total revenues	$	251,720	$	332,626	$	228,616	$	812,962
Transferred at a point-in-time	$	352	$	1,467	$	46,279	$	48,098
Transferred over time	251,368		331,159		182,337		764,864
Total revenues	$	251,720	$	332,626	$	228,616	$	812,962

10

Nine Months Ended September 30, 2021

	Eastern		Western		Resource Solutions		Total Revenues
Collection	$	124,389	$	199,278	$	—	$	323,667
Landfill	18,143		48,336		—		66,479
Transfer station	39,847		27,498		—		67,345
Transportation	148		8,646		—		8,794
Landfill gas-to-energy	784		2,873		—		3,657
Processing	5,246		1,508		65,721		72,475
Non-processing	—		—		104,958		104,958
Total revenues	$	188,557	$	288,139	$	170,679	$	647,375
Transferred at a point-in-time	$	125	$	1,284	$	44,964	$	46,373
Transferred over time	188,432		286,855		125,715		601,002
Total revenues	$	188,557	$	288,139	$	170,679	$	647,375

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 $5,460 and $15,162 in the three and nine months ended September 30, 2022, respectively, and $4,341 and $8,440 in the three and nine months ended September 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 nine months ended September 30, 2022 or September 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 $111,256 and $89,232 as of September 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 $3,891 and $3,404 as of September 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 nine months ended September 30, 2022 and September 30, 2021, respectively, when the services were performed.

4.    BUSINESS COMBINATIONS

In the nine months ended September 30, 2022, we acquired twelve businesses, including: an organic materials management business and 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, a transfer station, and six 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 nine months ended September 30, 2021, we acquired eight businesses, including: a residential, commercial and roll-off collection business in eastern Connecticut that operates a rail-served construction and demolition processing and waste transfer facility, a waste transfer station, a single-stream recycling facility, and several other recycling operations whose assets and liabilities are allocated between our Eastern region and Resource Solutions operating segments; a septic and portable toilet business, a tuck-in solid waste collection business and a solid waste collection business that operates a waste transfer station in our Eastern region; and a waste composting and food-scrap hauling business, a solid waste collection business that operates a waste transfer station, and two tuck-in solid waste collection businesses in our Western 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 two-year to ten-year period from the date of acquisition. All amounts recorded to goodwill are expected to be deductible for tax purposes.

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

	Nine Months Ended September 30,
	2022		2021
Purchase Price:
Cash used in acquisitions, net of cash acquired	$	72,731	$	150,364
Other non-cash consideration	1,220		—
Holdbacks to sellers and contingent consideration	4,112		4,865
Total consideration	$	78,063	$	155,229
Allocated as follows:
Current assets	$	7,599	$	7,260
Property, plant and equipment:
Land	3,141		803
Finance lease right-of-use-assets	—		31,467
Buildings and improvements	8,566		8,468
Machinery and equipment	10,296		42,458
Operating lease right-of-use assets	405		6,500
Intangible assets:
Trade names	—		8,350
Covenants not-to-compete	2,034		3,069
Customer relationships	11,417		30,340
Other non-current assets	40		—
Current liabilities	(3,721)		(5,952)
Other long-term liabilities	(123)		—
Financing lease liabilities, less current portion	—		(10,535)
Operating lease liabilities, less current portion	(282)		—
Fair value of assets acquired and liabilities assumed	39,372		122,228
Excess purchase price allocated to goodwill	$	38,691	$	33,001

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 September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Revenues	$	295,512	$	262,000	$	825,020	$	733,819
Operating income	$	36,247	$	28,516	$	79,473	$	64,360
Net income	$	22,635	$	15,308	$	44,888	$	27,993
Basic earnings per share attributable to common stockholders:
Weighted average common shares outstanding	51,677		51,389		51,604		51,312
Basic earnings per common share	$	0.44	$	0.30	$	0.87	$	0.55
Diluted earnings per share attributable to common stockholders:
Weighted average common shares outstanding	51,806		51,586		51,749		51,506
Diluted earnings per common share	$	0.44	$	0.30	$	0.87	$	0.54

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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.

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		September 30, 2022
Eastern	$	52,072	$	93	$	241	$	52,406
Western	163,728		16,892		650		181,270
Resource Solutions	17,060		21,706		—		38,766
	$	232,860	$	38,691	$	891	$	272,442

Summaries of intangible assets by type follows:

	Covenants Not-to-Compete		Customer Relationships		Trade Names		Total
Balance, September 30, 2022
Intangible assets	$	30,812	$	126,372	$	8,350	$	165,534
Less accumulated amortization	(23,609)		(43,254)		(3,879)		(70,742)
	$	7,203	$	83,118	$	4,471	$	94,792

	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 $4,281 and $12,333 during the three and nine months ended September 30, 2022, respectively, and $3,133 and $7,175 during the three and nine months ended September 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 September 30, 2022
Fiscal year ending December 31, 2022	$	4,194
Fiscal year ending December 31, 2023	$	15,918
Fiscal year ending December 31, 2024	$	15,278
Fiscal year ending December 31, 2025	$	14,244
Fiscal year ending December 31, 2026	$	12,579
Thereafter	$	32,579

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:

	Nine Months Ended September 30,
	2022		2021
Beginning balance	$	86,914	$	82,533
Obligations incurred	3,592		3,638
Revision in estimates (1)	1,443		—
Accretion expense	5,685		5,496
Obligations settled (2)	(3,027)		(5,394)
Ending balance	$	94,607	$	86,273

(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:

	September 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 ("Revolving Credit Facility") due December 2026; 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%	49,070		45,724
Notes payable maturing through August 2024; bearing interest at a weighted average of 1.6%	712		4,846
Principal amount of debt	596,782		562,570
Less—unamortized debt issuance costs (1)	9,983		10,166
Debt less unamortized debt issuance costs	586,799		552,404
Less—current maturities of debt	8,337		9,901
	$	578,462	$	542,503

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

	September 30, 2022		December 31, 2021
Revolving Credit Facility and Term Loan Facility (collectively, the "Credit Facility")	$	5,011	$	5,884
New York Bonds 2014R-1	882		933
New York Bonds 2014R-2	223		268
New York Bonds 2020	1,150		1,283
FAME Bonds 2005R-3	198		262
FAME Bonds 2015R-1	361		413
FAME Bonds 2015R-2	212		268
Vermont Bonds 2013	392		433
Vermont Bonds 2022A-1	1,176		—
New Hampshire Bonds	378		422
	$	9,983	$	10,166

Financing Activities

In the nine months ended September 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. We borrowed and used the proceeds from the Vermont Bonds 2022A-1 to finance or reimburse certain noncurrent asset costs associated with capital projects in the State of Vermont.

Credit Facility

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 September 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 September 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 September 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 September 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.

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

		Fair Value
	Balance Sheet Location	September 30, 2022		December 31, 2021
Interest rate swaps	Other current assets	$	3,526	$	—
Interest rate swaps	Other non-current assets	8,814		424
		$	12,340	$	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	$	12,340	$	(4,935)
Interest rate swaps - tax effect	Accumulated other comprehensive income (loss), net of tax	(4,410)		(168)
		$	7,930	$	(5,103)

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 $1,071 relating to our outstanding legal proceedings as of September 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 ("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 (“Council”) on the grounds it failed to meet the public benefit criteria.

Throughout 2021 and early 2022 a number of motions were filed by both NCES and CLF with the Council and in February 2022 the Council held a hearing on the CLF appeal.

The Council ruled 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.

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DES filed a Motion for Reconsideration with the Council on May 31, 2022 (“DES Reconsideration Motion”) and NCES filed a Motion for Rehearing on June 10, 2022 (“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 September 20, 2022, NCES and our subsidiary, Granite State Landfill, LLC (“GSL”), filed a Petition for Declaratory Judgment ("Petition") in Merrimack Superior Court seeking a determination of the meaning and constitutionality of New Hampshire’s public benefit requirement. On September 21, 2022, NCES filed a Motion to Stay the Council proceedings pending resolution of the Petition action. DES assented to the relief sought by that motion, and CLF filed an Objection to the Motion to Stay on September 26, 2022. On October 3, 2022, NCES filed a Motion for Leave to File Reply together with its Reply to CLF’s Objection to Motion to Stay. The aforesaid Motions remain pending before the Council as does the Petition before the Merrimack Superior Court. NCES will continue to vigorously defend the litigation before the Council and together with GSL will continue to pursue Declaratory Judgment before the Merrimack Superior Court.

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 risk-free interest rates associated with our environmental remediation liabilities as of September 30, 2022 range between 1.5% and 4.1%. A summary of the changes to the aggregate environmental remediation liabilities for the nine months ended September 30, 2022 and 2021 follows:

	Nine Months Ended September 30,
	2022		2021
Beginning balance	$	5,887	$	5,200
Accretion expense	79		82
Obligations incurred (1)	759		—
Obligations settled (2)	(353)		(281)
Ending balance	6,372		5,001
Less: current portion	646		375
Long-term portion	$	5,726	$	4,626

(1)Associated with the investigation of potential remediation at an inactive waste disposal site that adjoins one of the landfills that we operate.

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

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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 September 30, 2022, there were 793 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 five-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	75	$	82.47
Exercised	(23)	$	8.56
Forfeited	—	$	—
Outstanding, September 30, 2022	129	$	55.60	7.4	$	3,148
Exercisable, September 30, 2022	49	$	12.88	3.5	$	3,105

Stock-based compensation expense related to stock options was $89 and $122 during the three and nine months ended September 30, 2022, respectively, as compared to $11 during both the three and nine months ended September 30, 2021. As of September 30, 2022, we had $2,225 of unrecognized stock-based compensation expense related to outstanding stock options to be recognized over a weighted average period of 4.7 years.

During the three and nine months ended September 30, 2022, the aggregate intrinsic value of stock options exercised was zero dollars 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, typically three years, 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.

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

	Restricted Stock Awards, 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	$	94.23
Class A Common Stock Vested	(65)	$	49.85
Forfeited	(34)	$	67.92
Outstanding, September 30, 2022	232	$	68.83	1.7	$	17,692
Unvested, September 30, 2022	416	$	68.95	1.4	$	31,751

(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 awards, restricted stock units and performance stock units was $2,225 and $5,204 during the three and nine months ended September 30, 2022, respectively, as compared to $2,576 and $8,505 during the three and nine months ended September 30, 2021, respectively.

During the three and nine months ended September 30, 2022, the total fair value of other stock awards vested was $218 and $5,577, respectively.

As of September 30, 2022, total unrecognized stock-based compensation expense related to outstanding restricted stock awards was $46, which will be recognized over a weighted average period of 1.3 years. As of September 30, 2022, total unrecognized stock-based compensation expense related to outstanding restricted stock units was $4,611, which will be recognized over a weighted average period of 1.8 years. As of September 30, 2022, total expected unrecognized stock-based compensation expense related to outstanding performance stock units was $5,592 to be recognized over a weighted average period of 1.6 years.

We also recorded $97 and $262 of stock-based compensation expense related to our Amended and Restated 1997 Employee Stock Purchase Plan during the three and nine months ended September 30, 2022, respectively, as compared to $67 and $196 during the three and nine months ended September 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	15,138
Amounts reclassified from accumulated other comprehensive income (loss)	2,136
Income tax provision related to items of other comprehensive income	(4,241)
Net current-period other comprehensive income	13,033
Balance, September 30, 2022	$	7,930

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

	Three Months Ended September 30,				Nine Months Ended September 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	$	14	$	1,204	$	2,136	$	3,551	Interest expense
	(14)		(1,204)		(2,136)		(3,551)		Income before income taxes
	—		(496)		(190)		(765)		Provision for income taxes
	$	(14)	$	(708)	$	(1,946)	$	(2,786)	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 September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Numerator:
Net income	$	22,672	$	15,861	$	44,658	$	31,955
Denominators:
Number of shares outstanding, end of period:
Class A common stock	50,692		50,410		50,692		50,410
Class B common stock	988		988		988		988
Unvested restricted stock	(1)		(2)		(1)		(2)
Effect of weighted average shares outstanding	(2)		(7)		(75)		(84)
Basic weighted average common shares outstanding	51,677		51,389		51,604		51,312
Impact of potentially dilutive securities:
Dilutive effect of stock options and other stock awards	129		197		145		194
Diluted weighted average common shares outstanding	51,806		51,586		51,749		51,506
Anti-dilutive potentially issuable shares	84		12		115		12

11.    OTHER ITEMS AND CHARGES

Expense from Acquisition Activities

In the three and nine months ended September 30, 2022, we recorded charges of $816 and $3,878, respectively, and in the three and nine months ended September 30, 2021, we recorded charges of $1,904 and $3,950, 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.

Environmental Remediation Charge

In the three and nine months ended September 30, 2022, we recorded a charge of $759 associated with the investigation of potential remediation at an inactive waste disposal site that adjoins one of the landfills we operate.

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, 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 September 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	$	1,705	$	—	$	—
Interest rate swaps	—		12,340		—
	$	1,705	$	12,340	$	—

	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 September 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 $185,533 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 September 30, 2022, the carrying value of our Term Loan Facility was $350,000 and the carrying value of our Revolving Credit Facility was zero dollars. 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 Eastern and Western regions. 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 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 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 September 30, 2022

Segment	Outside revenues		Inter-company revenues		Depreciation and amortization		Operating income (loss)		Total assets
Eastern	$	93,137	$	23,027	$	11,907	$	10,061	$	361,950
Western	121,903		40,703		16,778		22,405		725,232
Resource Solutions	80,228		1,579		3,138		4,526		189,854
Corporate Entities	—		—		704		(704)		122,311
Eliminations	—		(65,309)		—		—		—
	$	295,268	$	—	$	32,527	$	36,288	$	1,399,347

Three Months Ended September 30, 2021

Segment	Outside revenues		Inter-company revenues		Depreciation and amortization		Operating income (loss)		Total assets
Eastern	$	75,154	$	18,768	$	9,407	$	5,374	$	352,067
Western	103,523		35,523		15,710		15,805		673,608
Resource Solutions	63,292		156		1,903		6,679		126,529
Corporate Entities	—		—		471		(471)		128,193
Eliminations	—		(54,447)		—		—		—
	$	241,969	$	—	$	27,491	$	27,387	$	1,280,397

Nine Months Ended September 30, 2022

Segment	Outside revenues		Inter-company revenues		Depreciation and amortization		Operating income (loss)		Total assets
Eastern	$	251,720	$	61,842	$	34,895	$	13,981	$	361,950
Western	332,626		112,687		47,376		51,565		725,232
Resource Solutions	228,616		2,673		9,011		14,453		189,854
Corporate Entities	—		—		1,824		(1,824)		122,311
Eliminations	—		(177,202)		—		—		—
	$	812,962	$	—	$	93,106	$	78,175	$	1,399,347

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Nine Months Ended September 30, 2021

Segment	Outside revenues		Inter-company revenues		Depreciation and amortization		Operating income (loss)		Total assets
Eastern	$	188,557	$	47,322	$	23,342	$	11,401	$	352,067
Western	288,139		97,771		44,838		38,462		673,608
Resource Solutions	170,679		3,337		5,020		12,792		126,529
Corporate Entities	—		—		1,310		(1,312)		128,193
Eliminations	—		(148,430)		—		—		—
	$	647,375	$	—	$	74,510	$	61,343	$	1,280,397

A summary of our revenues attributable to services provided follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Collection	$	144,117	$	118,872	$	400,910	$	323,667
Disposal	66,147		55,593		169,503		142,618
Power generation	1,643		1,253		6,050		3,657
Processing	3,133		2,959		7,883		6,754
Solid waste operations	215,040		178,677		584,346		476,696
Processing	32,159		27,418		93,421		65,721
Non-processing	48,069		35,874		135,195		104,958
Resource Solutions operations	80,228		63,292		228,616		170,679
Total revenues	$	295,268	$	241,969	$	812,962	$	647,375

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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 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.

As of October 15, 2022, we owned and/or operated 49 solid waste collection operations, 65 transfer stations, 26 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 station 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 property owners or occupants. 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 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 September 30,								$ Change		Nine Months Ended September 30,								$ Change
	2022				2021						2022				2021
Collection	$	144.1	48.8	%	$	118.9	49.1	%	$	25.2	$	400.9	49.3	%	$	323.7	50.0	%	$	77.2
Disposal	66.1		22.4	%	55.6		23.0	%	10.5		169.5		20.9	%	142.6		22.0	%	26.9
Power	1.6		0.6	%	1.3		0.5	%	0.3		6.1		0.7	%	3.7		0.6	%	2.4
Processing	3.2		1.0	%	2.9		1.2	%	0.3		7.8		1.0	%	6.7		1.0	%	1.1
Solid waste	215.0		72.8	%	178.7		73.8	%	36.3		584.3		71.9	%	476.7		73.6	%	107.6
Processing	32.2		10.9	%	27.4		11.4	%	4.8		93.5		11.5	%	65.7		10.2	%	27.8
Non-processing	48.1		16.3	%	35.9		14.8	%	12.2		135.2		16.6	%	105.0		16.2	%	30.2
Resource solutions	80.3		27.2	%	63.3		26.2	%	17.0		228.7		28.1	%	170.7		26.4	%	58.0
Total revenues	$	295.3	100.0	%	$	242.0	100.0	%	$	53.3	$	813.0	100.0	%	$	647.4	100.0	%	$	165.6

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 September 30, 2022 vs. 2021				Period-to-Period Change for the Nine Months Ended September 30, 2022 vs. 2021
	Amount		% Growth		Amount		% Growth
Price	$	11.9	6.6	%	$	30.7	6.4	%
Volume	3.5		2.0	%	6.9		1.4	%
Surcharges and other fees	11.5		6.6	%	21.7		4.6	%
Commodity price and volume	0.4		0.2	%	2.7		0.6	%
Acquisitions	9.0		5.0	%	45.6		9.6	%
Solid waste revenues	$	36.3	20.4	%	$	107.6	22.6	%

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:

•$8.5 million from favorable collection pricing; and

•$3.4 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:

•$23.1 million from favorable collection pricing; and

•$7.6 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 higher disposal volumes ($2.1 million relates to higher third-party landfill volumes, $0.7 million relates to higher transfer station volumes and $0.7 million relates to higher transportation volumes).

The volume change component in year-to-date solid waste revenues growth from the prior year period is the result of higher disposal volumes ($3.2 million relates to higher third-party landfill volumes, $2.2 million relates to higher transfer station volumes and $1.5 million relates to higher transportation volumes).

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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 and environmental fee ("E&E Fee") revenues and higher sustainability recycling adjustment fee ("SRA Fee") revenues. Higher E&E Fee revenues associated with our fuel cost recovery program were a result of higher diesel fuel prices. Higher SRA Fee revenues were a result of lower recycled commodity prices in the quarter and a higher overall customer participation rate. See Item 3. "Quantitative and Qualitative Disclosures about Market Risk" included in this Quarterly Report on Form 10-Q for additional information regarding our E&E Fee and SRA Fee.

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 due primarily to favorable energy pricing and, to a lesser extent, 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 within our Eastern and Western region operating segments in line with our growth strategy, including the timing and acquisition of ten businesses in the nine months ended September 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 $17.0 million from the prior year period is the result of the following:

•$11.5 million from acquisition activity; and

•$9.0 million from higher non-processing revenues due to higher volumes on organic business growth, favorable pricing and increased fees; partially offset by

•$(3.3) million primarily from the unfavorable impact of decreasing recycled commodity pricing on processing revenues, partially offset by higher tipping fees; and

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

The change component in year-to-date Resource Solutions revenues growth of $58.0 million from the prior year period is the result of the following:

•$38.0 million from acquisition activity;

•$18.3 million from higher non-processing revenues due to higher volumes on organic business growth, favorable pricing and increased fees; and

•$2.1 million from the favorable impact of recycled commodity and other processing pricing on processing revenues, partially offset by lower tipping fees, partially offset by

•$(0.4) million from lower processing volumes mainly driven by lower recycled 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 September 30,								$ Change		Nine Months Ended September 30,								$ Change
	2022				2021						2022				2021
Cost of operations	$	190.3	64.4	%	$	153.9	63.6	%	$	36.4	$	538.8	66.3	%	$	419.6	64.8	%	$	119.2
General and administration	$	34.3	11.6	%	$	31.0	12.8	%	$	3.3	$	97.7	12.0	%	$	87.3	13.5	%	$	10.4
Depreciation and amortization	$	32.5	11.0	%	$	27.5	11.4	%	$	5.0	$	93.1	11.5	%	$	74.5	11.5	%	$	18.6

Cost of Operations

Cost of operations includes (i) direct costs, which consist of the costs of purchased materials and third-party transportation and disposal costs, including third-party tipping fees, (ii) direct labor costs, which include salaries, wages, incentive compensation and related benefit costs such as health and welfare benefits and workers compensation, (iii) direct operational costs, which include landfill operating costs such as accretion expense related to final capping, closure and post-closure obligations, leachate treatment and disposal costs and depletion of landfill operating lease obligations, vehicle insurance costs, host community fees and royalties, (iv) fuel costs used by our vehicles and in conducting our operations, (v) maintenance and repair costs relating to our vehicles, equipment and containers and (vi) other operational costs including facility costs.

A summary of the major components of our cost of operations for the three and nine months ended September 30, 2022 and 2021 (dollars in millions and as a percentage of total revenues) is as follows:

	Three Months Ended September 30,								$ Change		Nine Months Ended September 30,								$ Change
	2022				2021						2022				2021
Direct costs	$	76.7	26.0	%	$	60.5	25.0	%	$	16.2	$	210.8	25.9	%	$	162.3	25.1	%	$	48.5
Direct labor costs	37.3		12.6	%	32.1		13.3	%	5.2		107.8		13.3	%	85.3		13.2	%	22.5
Direct operational costs	22.9		7.8	%	21.2		8.8	%	1.7		66.0		8.1	%	58.4		9.0	%	7.6
Fuel costs	12.1		4.1	%	7.1		3.0	%	5.0		35.6		4.4	%	18.9		2.9	%	16.7
Maintenance and repair costs	21.0		7.0	%	16.3		6.6	%	4.7		59.7		7.4	%	45.5		7.0	%	14.2
Other operational costs	20.3		6.9	%	16.7		6.9	%	3.6		58.9		7.2	%	49.2		7.6	%	9.7
	$	190.3	64.4	%	$	153.9	63.6	%	$	36.4	$	538.8	66.3	%	$	419.6	64.8	%	$	119.2

These cost categories may change from time to time and may not be comparable to similarly titled categories presented by other companies.

The most significant items impacting the changes in our cost of operations during the three and nine months ended September 30, 2022 and 2021 are summarized below:

•Direct costs increased in aggregate dollars due primarily to higher hauling and third-party transportation and disposal costs on (i) higher solid waste volumes driven by acquisition activity, (ii) higher fuel surcharges from third party haulers due to higher diesel fuel prices, (iii) higher third-party disposal rates due to inflationary pressures and (iv) higher non-processing volumes in our Resource Solutions operating segment; and higher purchased material costs on acquisition activity and higher average commodity prices year-to-date;

•Direct labor costs increased in aggregate dollars due primarily to acquisition-related growth, wage inflation and higher workers compensation costs on claims activity associated with an increased headcount;

•Direct operational costs decreased as a percentage of revenues, while increasing in aggregate dollars due primarily to (i) higher landfill operating costs in our Western region due to severe winter weather earlier in the year and construction delays compounded with higher landfill volumes, (ii) higher vehicle insurance costs, (iii) acquisition-related growth and (iv) inflationary pressures; partially offset by lower host community and royalty fees;

•Fuel costs increased in aggregate dollars due primarily to higher fuel prices and higher volumes driven by acquisition activity and, to a lesser extent, organic business growth. See Item 3. "Quantitative and Qualitative Disclosures about Market Risk" included in this Quarterly Report on Form 10-Q for additional information regarding our fuel costs;

•Maintenance and repair costs increased in aggregate dollars due primarily to acquisition related growth and higher fleet and container maintenance costs associated with inflationary pressures; and

•Other operational costs increased in aggregate dollars due primarily to higher facility costs driven by acquisition activity and inflationary pressures.

General and Administration

General and administration expense includes (i) salaries, wages, incentive compensation and related benefit costs such as health and welfare benefits and workers compensation costs related to management, clerical and administrative functions, (ii) professional service fees, (iii) bad debt expense, and (iv) other overhead costs including those associated with marketing, sales force and community relations efforts.

A summary of the major components of our general and administration expenses for the three and nine months ended September 30, 2022 and 2021 (dollars in millions and as a percentage of total revenues) is as follows:

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	Three Months Ended September 30,								$ Change		Nine Months Ended September 30,								$ Change
	2022				2021						2022				2021
Labor costs	$	23.5	7.9	%	$	20.5	8.5	%	$	3.0	$	66.9	8.2	%	$	61.6	9.5	%	$	5.3
Professional fees	1.8		0.6	%	2.3		1.0	%	(0.5)		5.2		0.6	%	5.4		0.8	%	(0.2)
Provision for bad debt expense	0.8		0.3	%	0.9		0.4	%	(0.1)		1.9		0.2	%	1.3		0.2	%	0.6
Other	8.2		2.8	%	7.3		2.9	%	0.9		23.7		3.0	%	19.0		3.0	%	4.7
	$	34.3	11.6	%	$	31.0	12.8	%	$	3.3	$	97.7	12.0	%	$	87.3	13.5	%	$	10.4

These cost categories may change from time to time and may not be comparable to similarly titled categories presented by other companies.

The most significant items impacting the changes in our general and administration expenses during the three and nine months ended September 30, 2022 and 2021 are summarized below:

•Labor costs decreased as a percentage of revenues, while increasing in aggregate dollars due primarily to acquisition-related growth, wage inflation and higher accrued incentive compensation on improved performance, partially offset by lower equity compensation costs; and

•Other costs increased in aggregate dollars due primarily to inflationary pressures and an increase in general overhead costs to support business growth.

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 September 30,								$ Change		Nine Months Ended September 30,								$ Change
	2022				2021						2022				2021
Depreciation	$	19.7	6.7	%	$	16.3	6.7	%	$	3.4	$	58.2	7.2	%	$	45.1	7.0	%	$	13.1
Landfill amortization	8.5		2.9	%	8.1		3.3	%	0.4		22.6		2.8	%	22.3		3.4	%	0.3
Other amortization	4.3		1.4	%	3.1		1.4	%	1.2		12.3		1.5	%	7.1		1.1	%	5.2
	$	32.5	11.0	%	$	27.5	11.4	%	$	5.0	$	93.1	11.5	%	$	74.5	11.5	%	$	18.6

The period-to-period increases in depreciation and other amortization expense can be primarily attributed to acquisition activity and increased investments in our fleet, whereas increases in landfill amortization expense can be attributed to increasing landfill volumes throughout the nine months ended September 30, 2022 and the volume mix at our landfills.

Expense from Acquisition Activities

In the three and nine months ended September 30, 2022, we recorded charges of $0.8 million and $3.9 million, respectively, and in the three and nine months ended September 30, 2021, we recorded charges of $1.9 million and $4.0 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.

Environmental Remediation Charge

In the three and nine months ended September 30, 2022, we recorded a charge of $0.8 million associated with the investigation of potential remediation at an inactive waste disposal site that adjoins one of our landfills.

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Other Expenses

Interest Expense, net

Our interest expense, net increased $0.9 million quarterly and $1.1 million year-to-date compared to the same periods in the prior year due primarily to rising interest rates and higher average debt balances associated with the issuance in June 2022 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 $2.5 million quarterly and $4.2 million year-to-date as compared to the same periods in the prior year due primarily to higher income from operations between the periods. The provision for income taxes in the nine months ended September 30, 2022 included $4.9 million of current income taxes and $13.8 million of deferred income taxes. For the nine months ended September 30, 2021, the provision included $1.5 million of current income taxes and $13 million of deferred income taxes. The effective rate for the nine months ended September 30, 2022 was 31.2% 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 $59.7 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.

Segment Reporting

Revenues

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

	Three Months Ended September 30,				$ Change		Nine Months Ended September 30,				$ Change
	2022		2021				2022		2021
Eastern	$	93.1	$	75.2	$	17.9	$	251.7	$	188.6	$	63.1
Western	121.9		103.5		18.4		332.6		288.1		44.5
Resource solutions	80.3		63.3		17.0		228.7		170.7		58.0
Total revenues	$	295.3	$	242.0	$	53.3	$	813.0	$	647.4	$	165.6

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 September 30, 2022 vs. 2021				Period-to-Period Change for the Nine Months Ended September 30, 2022 vs. 2021
	Amount		% Growth		Amount		% Growth
Price	$	5.5	7.4	%	$	13.9	7.3	%
Volume	2.9		3.8	%	5.5		3.1	%
Surcharges and other fees	5.1		6.8	%	9.5		5.0	%
Commodity price and volume	(0.1)		(0.1)	%	—		—	%
Acquisitions	4.5		6.0	%	34.2		18.1	%
Solid waste revenues	$	17.9	23.9	%	$	63.1	33.5	%

Price.

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

•$3.8 million from favorable collection pricing; and

•$1.7 million from favorable disposal pricing related to transfer stations and, to a lesser extent, landfills.

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

•$10.2 million from favorable collection pricing; and

•$3.7 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:

•$2.0 million from higher disposal volumes related to landfills, transportation services and, to a lesser extent, transfer stations; and

•$0.9 million from higher collection volumes as a result of organic business growth.

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

•$3.3 million from higher disposal volumes related to transfer stations, landfills and transportation services; and

•$2.2 million from higher collection volumes as a result of organic business growth.

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 due primarily to higher E&E Fees associated with our fuel cost recovery program on higher diesel fuel prices.

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 nine months ended September 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 September 30, 2022 vs. 2021				Period-to-Period Change for the Nine Months Ended September 30, 2022 vs. 2021
	Amount		% Growth		Amount		% Growth
Price	$	6.3	6.1	%	$	16.9	5.9	%
Volume	0.8		0.7	%	1.2		0.4	%
Surcharges and other fees	6.4		6.2	%	12.2		4.2	%
Commodity price and volume	0.4		0.4	%	2.7		0.9	%
Acquisitions	4.5		4.4	%	11.5		4.0	%
Solid waste revenues	$	18.4	17.8	%	$	44.5	15.4	%

Price.

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

•$4.7 million from favorable collection pricing; and

•$1.6 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:

•$13.0 million from favorable collection pricing; and

•$3.9 million from favorable disposal pricing related to landfills, transfer stations and, to a lesser extent, transportation services.

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Volume.

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

•$1.6 million from higher disposal volumes related to landfills and, to a lesser extent, transfer stations and transportation services; partially offset by

•$(0.8) million from lower collection volumes associated with higher customer churn due to higher pricing, implementation of the E&E Fee on additional customers 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:

•$3.6 million from higher disposal volumes related to landfills, transportation, and transfer stations; partially offset by

•$(2.4) million from lower collection volumes associated with higher customer churn due to higher pricing, implementation of the E&E Fee on additional customers 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 due primarily to higher E&E Fees associated with our fuel cost recovery program on higher diesel fuel 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 due primarily to 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 are the result of increased acquisition activity in line with our growth strategy, including the timing and acquisition of eight businesses in the nine months ended September 30, 2022 and five businesses in the fiscal year ended December 31, 2021.

Operating Income

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

	Three Months Ended September 30,				$ Change		Nine Months Ended September 30,				$ Change
	2022		2021				2022		2021
Eastern	$	10.1	$	5.4	$	4.7	$	14.0	$	11.4	$	2.6
Western	22.4		15.8		6.6		51.6		38.5		13.1
Resource Solutions	4.5		6.7		(2.2)		14.5		12.8		1.7
Corporate entities	(0.7)		(0.5)		(0.2)		(1.9)		(1.4)		(0.5)
Operating income	$	36.3	$	27.4	$	8.9	$	78.2	$	61.3	$	16.9

Eastern Region

Operating income increased $4.7 million quarterly and $2.6 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 nine months ended September 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 $14.6 million quarterly and $59.3 million year-to-date from the prior year periods due to the following:

•Direct costs increased in aggregate dollars due primarily to higher hauling and third-party transportation and disposal costs on (i) higher solid waste volumes driven by acquisition activity and, to a lesser extent, organic business growth, (ii) higher fuel surcharges from third party haulers due to higher diesel fuel prices and (iii) higher third-party disposal rates due to inflationary pressures;

•Direct labor costs increased in aggregate dollars due primarily to (i) acquisition-related and, to a lesser extent, organic business growth, (ii) wage inflation and (iii) higher workers compensation costs on claims activity associated with an increased headcount;

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•Fuel costs increased in aggregate dollars due primarily to higher fuel prices and higher volumes driven by acquisition activity and, to a lesser extent, organic business growth. See Item 3. "Quantitative and Qualitative Disclosures about Market Risk" included in this Quarterly Report on Form 10-Q for additional information regarding our fuel costs;

•Maintenance and repair costs increased in aggregate dollars due primarily to higher fleet and container maintenance costs associated with inflationary pressures and acquisition activity;

•Other operational costs increased in aggregate dollars due primarily to higher facility costs driven by acquisition activity and inflationary pressures; and

•Direct operational costs remained flat quarterly and increased year-to-date in aggregate dollars due to increased vehicle insurance costs and inflationary pressures.

General and administration

General and administration expense increased $1.5 million quarterly and $5.8 million year-to-date from the prior year periods due primarily to (i) acquisition-related growth, (ii) wage inflation, (iii) higher accrued incentive compensation on improved performance (iv) and an increase in general overhead costs associated with business growth and inflationary pressures; partially offset by lower equity compensation costs.

Depreciation and amortization

Depreciation and amortization expense increased $2.5 million quarterly and $11.6 million year-to-date from the prior year periods due primarily to acquisition activity, increased investment in our fleet, and higher landfill amortization expense due to higher quarterly landfill volumes and the volume mix at our landfills.

Western Region

Operating income increased $6.6 million quarterly and $13.1 million year-to-date from the prior year periods. Excluding the impact of the environmental remediation charge and expense from acquisition activities, our improved operating performance in the three and nine months ended September 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 $41.1 million year-to-date from the prior year periods due to the following:

•Direct costs increased in aggregate dollars due primarily to higher hauling and third-party transportation and disposal costs on (i) higher solid waste volumes driven by acquisition activity, partially offset by lower collection volumes, (ii) higher fuel surcharges from third party haulers due to higher diesel fuel prices and (iii) higher third-party disposal rates due to inflationary pressures;

•Fuel costs increased in aggregate dollars due to higher fuel prices and higher volumes driven by acquisition activity. See Item 3. "Quantitative and Qualitative Disclosures about Market Risk" included in this Quarterly Report on Form 10-Q for additional information regarding our fuel costs;

•Direct labor costs increased in aggregate dollars due primarily to (i) wage inflation, (ii) increased overtime on higher solid waste volumes associated with acquisition activity and (iii) higher workers compensation costs on claim activity associated with an increased headcount year-to-date;

•Maintenance and repair costs increased in aggregate dollars due primarily to higher fleet maintenance costs associated with acquisition activity and inflationary pressures;

•Direct operational costs increased in aggregate dollars due to (i) higher landfill operating costs from severe winter weather earlier in the year and construction delays compounded with higher quarterly landfill volumes, (ii) higher vehicle insurance costs and (iii) inflationary pressures; partially offset by lower host community and royalty fees; and

•Other operational costs increased in aggregate dollars due primarily to higher facility costs driven by acquisition activity and inflationary pressures.

General and administration

General and administration expense decreased $(0.1) million quarterly and increased $0.6 million year-to-date from the prior year periods, with the year-to-date increase due primarily to (i) acquisition-related growth, (ii) wage inflation, (iii) higher accrued incentive compensation on improved performance and (iv) an increase in general overhead costs associated with business growth and inflationary pressures; partially offset by lower equity compensation costs.

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Depreciation and amortization

Depreciation and amortization expense increased $1.1 million quarterly and $2.6 million year-to-date from the prior year periods due primarily to acquisition activity and increased investments in our fleet.

Resource Solutions

Operating income decreased $(2.2) million quarterly and increased $1.7 million year-to-date from the prior year periods. Excluding the impact of the expense from acquisition activities, our operating performance in the three and nine months ended September 30, 2022 was driven by revenue growth, inclusive of inter-company revenues, and the following cost changes.

Cost of operations

Cost of operations increased $17.7 million quarterly and $48.3 million year-to-date from the prior year periods due to the following:

•Direct costs increased in aggregate dollars due primarily to (i) higher hauling and third-party transportation costs on higher non-processing volumes (ii) higher fuel surcharges from third party haulers due to higher diesel fuel prices, (iii) inflationary pressures, and (iv) higher purchased material costs on acquisition activity and higher average commodity prices year-to-date;

•Direct labor costs increased in aggregate dollars due primarily to (i) acquisition activity and organic non-processing business growth, (ii) wage inflation and (iii) higher workers compensation costs on claim activity associated with an increased headcount;

•Other operational costs increased in aggregate dollars due primarily to higher facility costs driven by acquisition activity and inflationary pressures;

•Maintenance and repair costs increased in aggregate dollars due primarily to higher fleet maintenance costs associated with inflationary pressures, acquisition activity, and organic non-processing business growth;

•Direct operational costs increased in aggregate dollars due primarily to acquisition-related growth and inflationary pressures; and

•Fuel costs increased in aggregate dollars due to higher fuel prices and higher volumes driven by acquisition activity. See Item 3. "Quantitative and Qualitative Disclosures about Market Risk" included in this Quarterly Report on Form 10-Q for additional information regarding our fuel costs.

General and administration

General and administration expense increased $1.8 million quarterly and $3.6 million year-to-date from the prior year periods due to increased overhead costs associated with (i) acquisition activity and organic non-processing business growth, (ii) wage inflation, (iii) higher accrued incentive compensation on improved performance and (iv) an increase in general overhead costs associated with business growth and inflationary pressures; partially offset by lower equity compensation costs.

Depreciation and amortization

Depreciation and amortization expense increased $1.2 million quarterly and $4.0 million year-to-date from the prior year periods due to acquisition activity.

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 ("Revolving Credit Facility") as of September 30, 2022 to help meet our short-term and long-term liquidity needs. We expect existing cash and cash equivalents 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 the major indicators of our financial condition and liquidity (in millions) follows:

	September 30, 2022		December 31, 2021		$ Change
Cash and cash equivalents	$	47.9	$	33.8	$	14.1
Current assets, excluding cash and cash equivalents	$	143.5	$	112.7	$	30.8
Restricted assets	$	1.7	$	2.1	$	(0.4)
Total current liabilities:
Current liabilities, excluding current maturities of debt	$	154.5	$	142.3	$	12.2
Current maturities of debt	8.3		9.9		(1.6)
Total current liabilities	$	162.8	$	152.2	$	10.6
Debt, less current portion	$	588.4	$	552.7	$	35.7

Current assets, excluding cash and cash equivalents, increased $30.8 million and current liabilities increased $10.6 million in the nine months ended September 30, 2022, driven primarily by business and revenue growth resulting in a $20.2 million increase in working capital, excluding cash and cash equivalents, from $(39.5) million as of December 31, 2021 to $(19.3) million as of September 30, 2022. We strive to maintain a negative working capital cycle driven by shorter days sales outstanding as compared to days payable outstanding in an effort to collect money at a faster rate than paying bills to facilitate business growth.

Summary of Cash Flow Activity

Cash and cash equivalents increased $14.1 million in the nine months ended September 30, 2022. A summary of cash flows (in millions) follows:

	Nine Months Ended September 30,				$ Change
	2022		2021
Net cash provided by operating activities	$	152.4	$	134.1	$	18.3
Net cash used in investing activities	$	(161.1)	$	(234.1)	$	73.0
Net cash provided by (used in) financing activities	$	22.8	$	(7.9)	$	30.7

Cash flows from operating activities.

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

	Nine Months Ended September 30,
	2022		2021
Net income	$	44.7	$	32.0
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	93.1		74.5
Interest accretion on landfill and environmental remediation liabilities	6.0		5.9
Amortization of debt issuance costs	1.4		1.7
Stock-based compensation	5.6		8.7
Operating lease right-of-use assets expense	10.4		10.0
Gain on sale of property and equipment	(0.6)		—
Non-cash expense from acquisition activities	0.3		0.5
Deferred income taxes	13.8		13.0
	174.7		146.3
Changes in assets and liabilities, net	(22.3)		(12.2)
Net cash provided by operating activities	$	152.4	$	134.1

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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 $18.3 million in the nine months ended September 30, 2022 as compared to the nine months ended September 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 nine months ended September 30, 2022 as compared to the nine months ended September 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 nine months ended September 30, 2022 as compared to the nine months ended September 30, 2021 was due primarily to the following:

•a $(12.4) million unfavorable impact to operating cash flows associated with the change in accounts payable;

•a $(3.3) million unfavorable impact to operating cash flows associated with the change in accrued expenses and other liabilities; and

•a $(3.3) million unfavorable impact to operating cash flows associated with the change in accounts receivable associated primarily with increased revenues growth; partially offset by

•a $8.6 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:

	Nine Months Ended September 30,
	2022		2021
Acquisitions, net of cash acquired	$	(74.0)	$	(153.1)
Additions to property, plant and equipment	(87.7)		(81.6)
Proceeds from sale of property and equipment	0.6		0.6
Net cash used in investing activities	$	(161.1)	$	(234.1)

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

Acquisitions, net of cash acquired. In the nine months ended September 30, 2022, we acquired twelve businesses for total consideration of $78.1 million, including $72.7 million in cash, and paid $1.3 million in holdback payments on businesses previously acquired, as compared to the nine months ended September 30, 2021 during which we acquired eight businesses for total consideration of $155.2 million, including $150.4 million in cash, and paid $2.7 million in holdback payments on businesses previously acquired.

Capital expenditures. Capital expenditures increased $(6.1) million in the nine months ended September 30, 2022 as compared to the nine months ended September 30, 2021 due primarily to higher capital spend associated with landfill development, investments in newly acquired operations to drive synergies, the retrofitting of a single-stream material recovery facility and inflationary pressures, partially offset by 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.

Cash flows from financing activities.

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

	Nine Months Ended September 30,
	2022		2021
Proceeds from long-term borrowings	$	82.2	$	0.5
Principal payments on debt	(57.4)		(8.6)
Payments of debt issuance costs	(1.2)		—
Payments of contingent consideration	(1.0)		—
Proceeds from the exercise of share based awards	0.2		0.2
Net cash provided by (used in) financing activities	$	22.8	$	(7.9)

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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 $32.9 million. The increase in financing cash flows in the nine months ended September 30, 2022 is due primarily to the issuance of $35.0 million aggregate principal amount of Vermont Bonds 2022A-1 in June 2022.

Payment of debt issuance costs. We paid $1.2 million of debt issuance costs in the nine months ended September 30, 2022 related to the issuance 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 September 30, 2022, we had outstanding $350.0 million aggregate principal amount of borrowings under our term loan A facility ("Term Loan Facility") and no borrowings under our $300.0 million Revolving Credit Facility, with a $75.0 million sublimit for letters of credit. The Term Loan Facility and the Revolving Credit Facility (collectively, 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 September 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 September 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 September 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 September 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, $49.1 million aggregate principal amount of finance leases and $0.7 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 nine months ended September 30, 2022, we believe that our flexible pricing structures and 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 our fuel cost recovery program, which is the energy component of our E&E Fee, 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. See Item 3. "Quantitative and Qualitative Disclosures about Market Risk" included in this Quarterly Report on Form 10-Q for additional information regarding our fuel cost recovery program. 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 typically 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 diesel fuel prices, interest rates and certain commodity prices. We have a variety of strategies to mitigate these market risks, including those discussed below.

40

Fuel Price Risk

The price and supply of fuel are unpredictable and fluctuate based on events beyond our control, including among others, geopolitical developments, supply and demand for oil and gas, actions by the Organization of the Petroleum Exporting Countries and other oil and gas producers, war and unrest in oil producing countries and regional production patterns. Because fuel is needed to run our fleet of trucks and other aspects of our operations, price escalations for fuel increase our operating expenses. We have a fuel cost recovery program, which is the energy component of our energy and environmental fee ("E&E Fee") that is designed to offset some or all of the impact of diesel fuel price increases above a periodically reset floor and contemplates a minimum customer participation level to cover changes in our fuel costs. The energy component of the E&E Fee floats on a monthly basis based upon changes in a published diesel fuel price index and is tied to a price escalation index with a lookback provision, which results in a timing lag in our ability to match the changes in the fuel cost component of the fee to diesel fuel price fluctuations during periods of rapid price changes. In certain circumstances, a substantial rise or drop in fuel costs could materially affect our revenue and costs of operations. In addition, we are susceptible to increases in fuel surcharges from our vendors.

Based on our consumption levels in the last twelve months ended September 30, 2022, after considering physically settled fuel contracts we believe a $0.50 cent per gallon change in the price of diesel fuel would change our direct fuel costs by approximately $4.8 million per year. Offsetting these changes in direct fuel expense would be changes in the energy component of the E&E Fees charged to our customers. Based on participation rates as of September 30, 2022, we believe a $0.50 cent per gallon change in the price of diesel fuel would change the energy component of the E&E Fee by approximately $4.8 million per year.

Commodity Price Risk

We market a variety of materials, including fibers such as old corrugated cardboard and old newsprint, plastics, glass, ferrous and aluminum metals. We may use a number of strategies to mitigate impacts from these recycled material commodity price fluctuations including: (1) charging collection customers a floating sustainability recycling adjustment fee to reduce recycling commodity risks; (2) providing in-bound material recovery facilities (“MRF”) customers with a revenue share or indexed materials purchases in higher commodity price markets, or charging these same customers a processing cost or tipping fee per ton in lower commodity price markets; (3) selling recycled commodities to out-bound MRF customers through floor price or fixed price agreements; or (4) entering into fixed price contracts or hedges that mitigate the variability in cash flows generated from the sales of recycled paper at floating prices. Although we have introduced these risk mitigation programs to help offset volatility in commodity prices and to offset higher labor or capital costs to meet more stringent contamination standards, we cannot provide assurance that we can use these programs with our customers in all circumstances or that they will mitigate these risks in an evolving recycling environment. We do not use financial instruments for trading purposes and are not a party to any leveraged derivatives. As of September 30, 2022, we were not party to any commodity hedging agreements.

Should recycled material commodity prices change by $10 per ton, we estimate that our annual operating income margin would change by approximately $0.8 million annually, or $0.2 million quarterly. Our sensitivity to changes in commodity prices is complex because each customer contract is unique relative to revenue sharing, tipping or processing fees and other arrangements. The above operating income impact may not be indicative of future operating results and actual results may vary materially.

Interest Rate Risk

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 September 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 London Inter-Bank Offered Rate ("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 September 30, 2022. The agreements mature between May 2023 and June 2027. Additionally, as of September 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%.

41

As of September 30, 2022, we had $246.8 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 September 30, 2022. The weighted average interest rate on the variable rate portion of long-term debt was approximately 4.2% at September 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.

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 September 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 Securities and Exchange Commission’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 September 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 September 30, 2022 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

42

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 Securities and Exchange Commission'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.

43

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. The foregoing 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 which may negatively impact our operating results in the form of lower revenues or increased costs and/or liabilities.

We have historically grown through acquisitions, expect to 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.

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.

44

ITEM 6.    EXHIBITS

Exhibit No.	Description
10.1	Amendment to Amended and Restated Employment Agreement between Casella Waste Systems, Inc. and Edwin D. Johnson dated as of July 21, 2022. (incorporated herein by reference to Exhibit 10.5 to the quarterly report on Form 10-Q of Casella as filed on July 29, 2022 (file no. 000-23211)).
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 September 30, 2022 and December 31, 2021, (ii) Consolidated Statements of Operations for the three and nine months ended September 30, 2022 and 2021, (iii) Consolidated Statements of Comprehensive Income for the three and nine months ended September 30, 2022 and 2021, (iv) Consolidated Statements of Stockholders’ Equity for the three and nine months ended September 30, 2022 and 2021, (v) Consolidated Statements of Cash Flows for the nine months ended September 30, 2022 and 2021, and (vi) Notes to Consolidated Financial Statements.
+	Filed Herewith
++	Furnished Herewith

45

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: October 28, 2022	By: /s/ Kevin Drohan
	Kevin Drohan
	Vice President and Chief Accounting Officer
	(Principal Accounting Officer)
Date: October 28, 2022	By: /s/ Edmond R. Coletta
	Edmond R. Coletta
	President and Chief Financial Officer
	(Principal Financial Officer)

46

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: October 28, 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: October 28, 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 September 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: October 28, 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 September 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: October 28, 2022	By: /s/ Edmond R. Coletta
	President and Chief Financial Officer
	(Principal Financial Officer)

XML

COVER - shares	9 Months Ended
	Sep. 30, 2022	Oct. 15, 2022
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 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	Q3
Amendment Flag	false
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		50,692,053
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		988,200

XML

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
CURRENT ASSETS:
Cash and cash equivalents	$ 47,934	$ 33,809
Accounts receivable, net of allowance for credit losses of $4,265 and $3,276, respectively	108,010	86,979
Prepaid expenses	14,998	12,766
Inventory	13,432	9,729
Other current assets	7,109	3,196
Total current assets	191,483	146,479
Property, plant and equipment, net of accumulated depreciation and amortization of $1,038,576 and $973,094, respectively	685,348	644,604
Operating lease right-of-use assets	93,066	93,799
Goodwill	272,442	232,860
Intangible assets, net	94,792	93,723
Restricted assets	1,705	2,122
Cost method investments	10,967	11,264
Deferred income taxes	25,549	43,957
Other non-current assets	23,995	14,772
Total assets	1,399,347	1,283,580
CURRENT LIABILITIES:
Current maturities of debt	8,337	9,901
Current operating lease liabilities	6,898	7,307
Accounts payable	71,074	63,086
Accrued payroll and related expenses	20,056	22,210
Accrued interest	2,956	2,042
Contract liabilities	3,891	3,404
Current accrued final capping, closure and post-closure costs	10,880	7,915
Other accrued liabilities	38,740	36,328
Total current liabilities	162,832	152,193
Debt, less current portion	578,462	542,503
Operating lease liabilities, less current portion	58,528	56,375
Accrued final capping, closure and post-closure costs, less current portion	83,727	78,999
Deferred income taxes	522	868
Other long-term liabilities	28,717	30,185
COMMITMENTS AND CONTINGENCIES
STOCKHOLDERS' EQUITY:
Additional paid-in capital	658,453	652,045
Accumulated deficit	(180,341)	(224,999)
Accumulated other comprehensive income (loss), net of tax	7,930	(5,103)
Total stockholders' equity	486,559	422,457
Total liabilities and stockholders' equity	1,399,347	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	9 Months Ended	12 Months Ended
	Sep. 30, 2022 USD ($) vote $ / shares shares	Dec. 31, 2021 USD ($) vote $ / shares shares
Accounts receivable - trade, allowance for credit losses | $	$ 4,265	$ 3,276
Accumulated depreciation and amortization | $	$ 1,038,576	$ 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)	50,692,000	50,423,000
Common stock, shares outstanding (in shares)	50,692,000	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		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
Revenues	$ 295,268	$ 241,969	$ 812,962	$ 647,375
Operating expenses:
Cost of operations	190,285	153,892	538,779	419,583
General and administration	34,348	30,993	97,702	87,336
Depreciation and amortization	32,527	27,491	93,106	74,510
Expense from acquisition activities	816	1,904	3,878	3,950
Environmental remediation charge	759	0	759	0
Southbridge Landfill closure charge	245	302	563	653
Total operating expenses	258,980	214,582	734,787	586,032
Operating income	36,288	27,387	78,175	61,343
Other expense (income):
Interest income	(178)	(61)	(260)	(191)
Interest expense	6,177	5,164	17,078	15,928
Other income	(1,523)	(178)	(1,978)	(825)
Other expense, net	4,476	4,925	14,840	14,912
Income before income taxes	31,812	22,462	63,335	46,431
Provision for income taxes	9,140	6,601	18,677	14,476
Net income	$ 22,672	$ 15,861	$ 44,658	$ 31,955
Basic earnings per share attributable to common stockholders:
Weighted average common shares outstanding, basic (in shares)	51,677	51,389	51,604	51,312
Basic earnings per common share (in dollars per share)	$ 0.44	$ 0.31	$ 0.87	$ 0.62
Diluted earnings per share attributable to common stockholders:
Weighted average common shares outstanding, diluted (in shares)	51,806	51,586	51,749	51,506
Diluted earnings per common share (in dollars per share)	$ 0.44	$ 0.31	$ 0.86	$ 0.62

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UNAUDITED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 22,672	$ 15,861	$ 44,658	$ 31,955
Hedging activity:
Interest rate swap settlements	(129)	(1,205)	(2,224)	(3,551)
Interest rate swap amounts reclassified into interest expense	14	1,204	2,136	3,551
Unrealized gain resulting from changes in fair value of derivative instruments	5,493	1,215	17,362	5,866
Other comprehensive income, before tax	5,378	1,214	17,274	5,866
Income tax provision related to items of other comprehensive income	1,468	322	4,241	1,379
Other comprehensive income, net of tax	3,910	892	13,033	4,487
Comprehensive income	$ 26,582	$ 16,753	$ 57,691	$ 36,442

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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)	31,955
Hedging activity	4,487
Ending balance at Sep. 30, 2021	407,951	648,611	(234,144)	(7,030)		$ 504		$ 10
Ending balance (in shares) at Sep. 30, 2021					50,410,000	50,410,000	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		988,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuances of Class A common stock	51	51
Issuance of Class A common stock (in shares)						12,000
Stock-based compensation	2,655	2,655
Net income (loss)	15,861		15,861
Hedging activity	892			892
Ending balance at Sep. 30, 2021	407,951	648,611	(234,144)	(7,030)		$ 504		$ 10
Ending balance (in shares) at Sep. 30, 2021					50,410,000	50,410,000	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)	44,658
Hedging activity	13,033
Ending balance at Sep. 30, 2022	486,559	658,453	(180,341)	7,930		$ 507		$ 10
Ending balance (in shares) at Sep. 30, 2022					50,692,000	50,692,000	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		988,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuances of Class A common stock	0
Issuance of Class A common stock (in shares)						2,000
Stock-based compensation	2,411	2,411
Net income (loss)	22,672		22,672
Hedging activity	3,910			3,910
Ending balance at Sep. 30, 2022	$ 486,559	$ 658,453	$ (180,341)	$ 7,930		$ 507		$ 10
Ending balance (in shares) at Sep. 30, 2022					50,692,000	50,692,000	988,000	988,000

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UNAUDITED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Cash Flows from Operating Activities:
Net income	$ 44,658	$ 31,955
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	93,106	74,510
Interest accretion on landfill and environmental remediation liabilities	6,018	5,915
Amortization of debt issuance costs	1,414	1,716
Stock-based compensation	5,589	8,712
Operating lease right-of-use assets expense	10,405	9,981
Gain on sale of property and equipment	(580)	0
Non-cash expense from acquisition activities	298	532
Deferred income taxes	13,819	12,974
Changes in assets and liabilities, net of effects of acquisitions and divestitures:
Accounts receivable	(14,230)	(10,943)
Landfill operating lease contract expenditures	(3,336)	(3,646)
Accounts payable	7,946	20,318
Prepaid expenses, inventories and other assets	(5,799)	(14,391)
Accrued expenses, contract liabilities and other liabilities	(6,877)	(3,544)
Net cash provided by operating activities	152,431	134,089
Cash Flows from Investing Activities:
Acquisitions, net of cash acquired	(73,963)	(153,112)
Additions to property, plant and equipment	(87,667)	(81,577)
Proceeds from sale of property and equipment	571	593
Net cash used in investing activities	(161,059)	(234,096)
Cash Flows from Financing Activities:
Proceeds from debt borrowings	82,200	500
Principal payments on debt	(57,407)	(8,517)
Payments of debt issuance costs	(1,232)	0
Payments of contingent consideration	(1,000)	0
Proceeds from the exercise of share based awards	192	163
Net cash provided by (used in) financing activities	22,753	(7,854)
Net increase (decrease) in cash and cash equivalents	14,125	(107,861)
Cash and cash equivalents, beginning of period	33,809	154,342
Cash and cash equivalents, end of period	47,934	46,481
Supplemental Disclosure of Cash Flow Information:
Cash interest payments	14,750	14,378
Cash income tax payments	2,875	597
Right-of-use assets obtained in exchange for new finance lease liabilities	9,420	18,153
Right-of-use assets obtained in exchange for operating lease obligations	$ 7,672	$ 3,566

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BASIS OF PRESENTATION

9 Months Ended

Sep. 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 nine months ended September 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 September 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

9 Months Ended

Sep. 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 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

9 Months Ended

Sep. 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 nine months ended September 30, 2022 and 2021:

Three Months Ended September 30, 2022

	Eastern		Western		Resource Solutions		Total Revenues
Collection	$	61,875	$	82,242	$	—	$	144,117
Landfill	7,900		20,240		—		28,140
Transfer station	19,525		13,230		—		32,755
Transportation	1,233		4,019		—		5,252
Landfill gas-to-energy	205		1,438		—		1,643
Processing	2,399		734		32,159		35,292
Non-processing	—		—		48,069		48,069
Total revenues	$	93,137	$	121,903	$	80,228	$	295,268
Transferred at a point-in-time	$	115	$	439	$	12,380	$	12,934
Transferred over time	93,022		121,464		67,848		282,334
Total revenues	$	93,137	$	121,903	$	80,228	$	295,268

Three Months Ended September 30, 2021

	Eastern		Western		Resource Solutions		Total Revenues
Collection	$	48,951	$	69,921	$	—	$	118,872
Landfill	6,622		18,201		—		24,823
Transfer station	16,948		10,375		—		27,323
Transportation	54		3,393		—		3,447
Landfill gas-to-energy	269		984		—		1,253
Processing	2,310		649		27,418		30,377
Non-processing	—		—		35,874		35,874
Total revenues	$	75,154	$	103,523	$	63,292	$	241,969
Transferred at a point-in-time	$	43	$	296	$	19,927	$	20,266
Transferred over time	75,111		103,227		43,365		221,703
Total revenues	$	75,154	$	103,523	$	63,292	$	241,969

Nine Months Ended September 30, 2022

	Eastern		Western		Resource Solutions		Total Revenues
Collection	$	172,671	$	228,239	$	—	$	400,910
Landfill	19,819		53,028		—		72,847
Transfer station	48,431		33,055		—		81,486
Transportation	4,470		10,700		—		15,170
Landfill gas-to-energy	727		5,323		—		6,050
Processing	5,602		2,281		93,421		101,304
Non-processing	—		—		135,195		135,195
Total revenues	$	251,720	$	332,626	$	228,616	$	812,962
Transferred at a point-in-time	$	352	$	1,467	$	46,279	$	48,098
Transferred over time	251,368		331,159		182,337		764,864
Total revenues	$	251,720	$	332,626	$	228,616	$	812,962

Nine Months Ended September 30, 2021

	Eastern		Western		Resource Solutions		Total Revenues
Collection	$	124,389	$	199,278	$	—	$	323,667
Landfill	18,143		48,336		—		66,479
Transfer station	39,847		27,498		—		67,345
Transportation	148		8,646		—		8,794
Landfill gas-to-energy	784		2,873		—		3,657
Processing	5,246		1,508		65,721		72,475
Non-processing	—		—		104,958		104,958
Total revenues	$	188,557	$	288,139	$	170,679	$	647,375
Transferred at a point-in-time	$	125	$	1,284	$	44,964	$	46,373
Transferred over time	188,432		286,855		125,715		601,002
Total revenues	$	188,557	$	288,139	$	170,679	$	647,375

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 $5,460 and $15,162 in the three and nine months ended September 30, 2022, respectively, and $4,341 and $8,440 in the three and nine months ended September 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 nine months ended September 30, 2022 or September 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 $111,256 and $89,232 as of September 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 $3,891 and $3,404 as of September 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 nine months ended September 30, 2022 and September 30, 2021, respectively, when the services were performed.

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BUSINESS COMBINATIONS

9 Months Ended

Sep. 30, 2022

Business Combination and Asset Acquisition [Abstract]

BUSINESS COMBINATIONS

BUSINESS COMBINATIONS

In the nine months ended September 30, 2022, we acquired twelve businesses, including: an organic materials management business and 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, a transfer station, and six 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 nine months ended September 30, 2021, we acquired eight businesses, including: a residential, commercial and roll-off collection business in eastern Connecticut that operates a rail-served construction and demolition processing and waste transfer facility, a waste transfer station, a single-stream recycling facility, and several other recycling operations whose assets and liabilities are allocated between our Eastern region and Resource Solutions operating segments; a septic and portable toilet business, a tuck-in solid waste collection business and a solid waste collection business that operates a waste transfer station in our Eastern region; and a waste composting and food-scrap hauling business, a solid waste collection business that operates a waste transfer station, and two tuck-in solid waste collection businesses in our Western 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 two-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:

	Nine Months Ended September 30,
	2022		2021
Purchase Price:
Cash used in acquisitions, net of cash acquired	$	72,731	$	150,364
Other non-cash consideration	1,220		—
Holdbacks to sellers and contingent consideration	4,112		4,865
Total consideration	$	78,063	$	155,229
Allocated as follows:
Current assets	$	7,599	$	7,260
Property, plant and equipment:
Land	3,141		803
Finance lease right-of-use-assets	—		31,467
Buildings and improvements	8,566		8,468
Machinery and equipment	10,296		42,458
Operating lease right-of-use assets	405		6,500
Intangible assets:
Trade names	—		8,350
Covenants not-to-compete	2,034		3,069
Customer relationships	11,417		30,340
Other non-current assets	40		—
Current liabilities	(3,721)		(5,952)
Other long-term liabilities	(123)		—
Financing lease liabilities, less current portion	—		(10,535)
Operating lease liabilities, less current portion	(282)		—
Fair value of assets acquired and liabilities assumed	39,372		122,228
Excess purchase price allocated to goodwill	$	38,691	$	33,001

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 September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Revenues	$	295,512	$	262,000	$	825,020	$	733,819
Operating income	$	36,247	$	28,516	$	79,473	$	64,360
Net income	$	22,635	$	15,308	$	44,888	$	27,993
Basic earnings per share attributable to common stockholders:
Weighted average common shares outstanding	51,677		51,389		51,604		51,312
Basic earnings per common share	$	0.44	$	0.30	$	0.87	$	0.55
Diluted earnings per share attributable to common stockholders:
Weighted average common shares outstanding	51,806		51,586		51,749		51,506
Diluted earnings per common share	$	0.44	$	0.30	$	0.87	$	0.54

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

9 Months Ended

Sep. 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		September 30, 2022
Eastern	$	52,072	$	93	$	241	$	52,406
Western	163,728		16,892		650		181,270
Resource Solutions	17,060		21,706		—		38,766
	$	232,860	$	38,691	$	891	$	272,442

Summaries of intangible assets by type follows:

	Covenants Not-to-Compete		Customer Relationships		Trade Names		Total
Balance, September 30, 2022
Intangible assets	$	30,812	$	126,372	$	8,350	$	165,534
Less accumulated amortization	(23,609)		(43,254)		(3,879)		(70,742)
	$	7,203	$	83,118	$	4,471	$	94,792

	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 $4,281 and $12,333 during the three and nine months ended September 30, 2022, respectively, and $3,133 and $7,175 during the three and nine months ended September 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 September 30, 2022
Fiscal year ending December 31, 2022	$	4,194
Fiscal year ending December 31, 2023	$	15,918
Fiscal year ending December 31, 2024	$	15,278
Fiscal year ending December 31, 2025	$	14,244
Fiscal year ending December 31, 2026	$	12,579
Thereafter	$	32,579

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ACCRUED FINAL CAPPING, CLOSURE AND POST CLOSURE

9 Months Ended

Sep. 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:

	Nine Months Ended September 30,
	2022		2021
Beginning balance	$	86,914	$	82,533
Obligations incurred	3,592		3,638
Revision in estimates (1)	1,443		—
Accretion expense	5,685		5,496
Obligations settled (2)	(3,027)		(5,394)
Ending balance	$	94,607	$	86,273

(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

9 Months Ended

Sep. 30, 2022

Debt And Derivatives Disclosure [Abstract]

DEBT

DEBT

A summary of debt is as follows:

	September 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 ("Revolving Credit Facility") due December 2026; 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%	49,070		45,724
Notes payable maturing through August 2024; bearing interest at a weighted average of 1.6%	712		4,846
Principal amount of debt	596,782		562,570
Less—unamortized debt issuance costs (1)	9,983		10,166
Debt less unamortized debt issuance costs	586,799		552,404
Less—current maturities of debt	8,337		9,901
	$	578,462	$	542,503

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

	September 30, 2022		December 31, 2021
Revolving Credit Facility and Term Loan Facility (collectively, the "Credit Facility")	$	5,011	$	5,884
New York Bonds 2014R-1	882		933
New York Bonds 2014R-2	223		268
New York Bonds 2020	1,150		1,283
FAME Bonds 2005R-3	198		262
FAME Bonds 2015R-1	361		413
FAME Bonds 2015R-2	212		268
Vermont Bonds 2013	392		433
Vermont Bonds 2022A-1	1,176		—
New Hampshire Bonds	378		422
	$	9,983	$	10,166

Financing Activities

In the nine months ended September 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. We borrowed and used the proceeds from the Vermont Bonds 2022A-1 to finance or reimburse certain noncurrent asset costs associated with capital projects in the State of Vermont.

Credit Facility

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 September 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 September 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 September 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 September 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	September 30, 2022		December 31, 2021
Interest rate swaps	Other current assets	$	3,526	$	—
Interest rate swaps	Other non-current assets	8,814		424
		$	12,340	$	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	$	12,340	$	(4,935)
Interest rate swaps - tax effect	Accumulated other comprehensive income (loss), net of tax	(4,410)		(168)
		$	7,930	$	(5,103)

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COMMITMENTS AND CONTINGENCIES

9 Months Ended

Sep. 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 $1,071 relating to our outstanding legal proceedings as of September 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 ("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 (“Council”) on the grounds it failed to meet the public benefit criteria.

Throughout 2021 and early 2022 a number of motions were filed by both NCES and CLF with the Council and in February 2022 the Council held a hearing on the CLF appeal.

The Council ruled 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 (“DES Reconsideration Motion”) and NCES filed a Motion for Rehearing on June 10, 2022 (“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 September 20, 2022, NCES and our subsidiary, Granite State Landfill, LLC (“GSL”), filed a Petition for Declaratory Judgment ("Petition") in Merrimack Superior Court seeking a determination of the meaning and constitutionality of New Hampshire’s public benefit requirement. On September 21, 2022, NCES filed a Motion to Stay the Council proceedings pending resolution of the Petition action. DES assented to the relief sought by that motion, and CLF filed an Objection to the Motion to Stay on September 26, 2022. On October 3, 2022, NCES filed a Motion for Leave to File Reply together with its Reply to CLF’s Objection to Motion to Stay. The aforesaid Motions remain pending before the Council as does the Petition before the Merrimack Superior Court. NCES will continue to vigorously defend the litigation before the Council and together with GSL will continue to pursue Declaratory Judgment before the Merrimack Superior Court.

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 risk-free interest rates associated with our environmental remediation liabilities as of September 30, 2022 range between 1.5% and 4.1%. A summary of the changes to the aggregate environmental remediation liabilities for the nine months ended September 30, 2022 and 2021 follows:

	Nine Months Ended September 30,
	2022		2021
Beginning balance	$	5,887	$	5,200
Accretion expense	79		82
Obligations incurred (1)	759		—
Obligations settled (2)	(353)		(281)
Ending balance	6,372		5,001
Less: current portion	646		375
Long-term portion	$	5,726	$	4,626

(1)Associated with the investigation of potential remediation at an inactive waste disposal site that adjoins one of the landfills that we operate.

(2)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

9 Months Ended

Sep. 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 September 30, 2022, there were 793 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 five-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	75	$	82.47
Exercised	(23)	$	8.56
Forfeited	—	$	—
Outstanding, September 30, 2022	129	$	55.60	7.4	$	3,148
Exercisable, September 30, 2022	49	$	12.88	3.5	$	3,105

Stock-based compensation expense related to stock options was $89 and $122 during the three and nine months ended September 30, 2022, respectively, as compared to $11 during both the three and nine months ended September 30, 2021. As of September 30, 2022, we had $2,225 of unrecognized stock-based compensation expense related to outstanding stock options to be recognized over a weighted average period of 4.7 years.

During the three and nine months ended September 30, 2022, the aggregate intrinsic value of stock options exercised was zero dollars 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, typically three years, 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 award, restricted stock unit and performance stock unit activity follows:

	Restricted Stock Awards, 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	$	94.23
Class A Common Stock Vested	(65)	$	49.85
Forfeited	(34)	$	67.92
Outstanding, September 30, 2022	232	$	68.83	1.7	$	17,692
Unvested, September 30, 2022	416	$	68.95	1.4	$	31,751

(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 awards, restricted stock units and performance stock units was $2,225 and $5,204 during the three and nine months ended September 30, 2022, respectively, as compared to $2,576 and $8,505 during the three and nine months ended September 30, 2021, respectively.

During the three and nine months ended September 30, 2022, the total fair value of other stock awards vested was $218 and $5,577, respectively.

As of September 30, 2022, total unrecognized stock-based compensation expense related to outstanding restricted stock awards was $46, which will be recognized over a weighted average period of 1.3 years. As of September 30, 2022, total unrecognized stock-based compensation expense related to outstanding restricted stock units was $4,611, which will be recognized over a weighted average period of 1.8 years. As of September 30, 2022, total expected unrecognized stock-based compensation expense related to outstanding performance stock units was $5,592 to be recognized over a weighted average period of 1.6 years.

We also recorded $97 and $262 of stock-based compensation expense related to our Amended and Restated 1997 Employee Stock Purchase Plan during the three and nine months ended September 30, 2022, respectively, as compared to $67 and $196 during the three and nine months ended September 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	15,138
Amounts reclassified from accumulated other comprehensive income (loss)	2,136
Income tax provision related to items of other comprehensive income	(4,241)
Net current-period other comprehensive income	13,033
Balance, September 30, 2022	$	7,930

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

	Three Months Ended September 30,				Nine Months Ended September 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	$	14	$	1,204	$	2,136	$	3,551	Interest expense
	(14)		(1,204)		(2,136)		(3,551)		Income before income taxes
	—		(496)		(190)		(765)		Provision for income taxes
	$	(14)	$	(708)	$	(1,946)	$	(2,786)	Net income

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EARNINGS PER SHARE

9 Months Ended

Sep. 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 September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Numerator:
Net income	$	22,672	$	15,861	$	44,658	$	31,955
Denominators:
Number of shares outstanding, end of period:
Class A common stock	50,692		50,410		50,692		50,410
Class B common stock	988		988		988		988
Unvested restricted stock	(1)		(2)		(1)		(2)
Effect of weighted average shares outstanding	(2)		(7)		(75)		(84)
Basic weighted average common shares outstanding	51,677		51,389		51,604		51,312
Impact of potentially dilutive securities:
Dilutive effect of stock options and other stock awards	129		197		145		194
Diluted weighted average common shares outstanding	51,806		51,586		51,749		51,506
Anti-dilutive potentially issuable shares	84		12		115		12

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OTHER ITEMS AND CHARGES

9 Months Ended

Sep. 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 nine months ended September 30, 2022, we recorded charges of $816 and $3,878, respectively, and in the three and nine months ended September 30, 2021, we recorded charges of $1,904 and $3,950, 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.

Environmental Remediation Charge

In the three and nine months ended September 30, 2022, we recorded a charge of $759 associated with the investigation of potential remediation at an inactive waste disposal site that adjoins one of the landfills we operate.

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FAIR VALUE OF FINANCIAL INSTRUMENTS

9 Months Ended

Sep. 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, 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 September 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	$	1,705	$	—	$	—
Interest rate swaps	—		12,340		—
	$	1,705	$	12,340	$	—

	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 September 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 $185,533 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 September 30, 2022, the carrying value of our Term Loan Facility was $350,000 and the carrying value of our Revolving Credit Facility was zero dollars. 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

9 Months Ended

Sep. 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 Eastern and Western regions. 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 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 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 September 30, 2022

Segment	Outside revenues		Inter-company revenues		Depreciation and amortization		Operating income (loss)		Total assets
Eastern	$	93,137	$	23,027	$	11,907	$	10,061	$	361,950
Western	121,903		40,703		16,778		22,405		725,232
Resource Solutions	80,228		1,579		3,138		4,526		189,854
Corporate Entities	—		—		704		(704)		122,311
Eliminations	—		(65,309)		—		—		—
	$	295,268	$	—	$	32,527	$	36,288	$	1,399,347

Three Months Ended September 30, 2021

Segment	Outside revenues		Inter-company revenues		Depreciation and amortization		Operating income (loss)		Total assets
Eastern	$	75,154	$	18,768	$	9,407	$	5,374	$	352,067
Western	103,523		35,523		15,710		15,805		673,608
Resource Solutions	63,292		156		1,903		6,679		126,529
Corporate Entities	—		—		471		(471)		128,193
Eliminations	—		(54,447)		—		—		—
	$	241,969	$	—	$	27,491	$	27,387	$	1,280,397

Nine Months Ended September 30, 2022

Segment	Outside revenues		Inter-company revenues		Depreciation and amortization		Operating income (loss)		Total assets
Eastern	$	251,720	$	61,842	$	34,895	$	13,981	$	361,950
Western	332,626		112,687		47,376		51,565		725,232
Resource Solutions	228,616		2,673		9,011		14,453		189,854
Corporate Entities	—		—		1,824		(1,824)		122,311
Eliminations	—		(177,202)		—		—		—
	$	812,962	$	—	$	93,106	$	78,175	$	1,399,347

Nine Months Ended September 30, 2021

Segment	Outside revenues		Inter-company revenues		Depreciation and amortization		Operating income (loss)		Total assets
Eastern	$	188,557	$	47,322	$	23,342	$	11,401	$	352,067
Western	288,139		97,771		44,838		38,462		673,608
Resource Solutions	170,679		3,337		5,020		12,792		126,529
Corporate Entities	—		—		1,310		(1,312)		128,193
Eliminations	—		(148,430)		—		—		—
	$	647,375	$	—	$	74,510	$	61,343	$	1,280,397

A summary of our revenues attributable to services provided follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Collection	$	144,117	$	118,872	$	400,910	$	323,667
Disposal	66,147		55,593		169,503		142,618
Power generation	1,643		1,253		6,050		3,657
Processing	3,133		2,959		7,883		6,754
Solid waste operations	215,040		178,677		584,346		476,696
Processing	32,159		27,418		93,421		65,721
Non-processing	48,069		35,874		135,195		104,958
Resource Solutions operations	80,228		63,292		228,616		170,679
Total revenues	$	295,268	$	241,969	$	812,962	$	647,375

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ACCOUNTING CHANGES (Policies)

9 Months Ended

Sep. 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 nine months ended September 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 September 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 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, 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 Eastern and Western regions. 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 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 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)

9 Months Ended

Sep. 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 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)

9 Months Ended

Sep. 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 nine months ended September 30, 2022 and 2021:

Three Months Ended September 30, 2022

	Eastern		Western		Resource Solutions		Total Revenues
Collection	$	61,875	$	82,242	$	—	$	144,117
Landfill	7,900		20,240		—		28,140
Transfer station	19,525		13,230		—		32,755
Transportation	1,233		4,019		—		5,252
Landfill gas-to-energy	205		1,438		—		1,643
Processing	2,399		734		32,159		35,292
Non-processing	—		—		48,069		48,069
Total revenues	$	93,137	$	121,903	$	80,228	$	295,268
Transferred at a point-in-time	$	115	$	439	$	12,380	$	12,934
Transferred over time	93,022		121,464		67,848		282,334
Total revenues	$	93,137	$	121,903	$	80,228	$	295,268

Three Months Ended September 30, 2021

	Eastern		Western		Resource Solutions		Total Revenues
Collection	$	48,951	$	69,921	$	—	$	118,872
Landfill	6,622		18,201		—		24,823
Transfer station	16,948		10,375		—		27,323
Transportation	54		3,393		—		3,447
Landfill gas-to-energy	269		984		—		1,253
Processing	2,310		649		27,418		30,377
Non-processing	—		—		35,874		35,874
Total revenues	$	75,154	$	103,523	$	63,292	$	241,969
Transferred at a point-in-time	$	43	$	296	$	19,927	$	20,266
Transferred over time	75,111		103,227		43,365		221,703
Total revenues	$	75,154	$	103,523	$	63,292	$	241,969

Nine Months Ended September 30, 2022

	Eastern		Western		Resource Solutions		Total Revenues
Collection	$	172,671	$	228,239	$	—	$	400,910
Landfill	19,819		53,028		—		72,847
Transfer station	48,431		33,055		—		81,486
Transportation	4,470		10,700		—		15,170
Landfill gas-to-energy	727		5,323		—		6,050
Processing	5,602		2,281		93,421		101,304
Non-processing	—		—		135,195		135,195
Total revenues	$	251,720	$	332,626	$	228,616	$	812,962
Transferred at a point-in-time	$	352	$	1,467	$	46,279	$	48,098
Transferred over time	251,368		331,159		182,337		764,864
Total revenues	$	251,720	$	332,626	$	228,616	$	812,962

Nine Months Ended September 30, 2021

	Eastern		Western		Resource Solutions		Total Revenues
Collection	$	124,389	$	199,278	$	—	$	323,667
Landfill	18,143		48,336		—		66,479
Transfer station	39,847		27,498		—		67,345
Transportation	148		8,646		—		8,794
Landfill gas-to-energy	784		2,873		—		3,657
Processing	5,246		1,508		65,721		72,475
Non-processing	—		—		104,958		104,958
Total revenues	$	188,557	$	288,139	$	170,679	$	647,375
Transferred at a point-in-time	$	125	$	1,284	$	44,964	$	46,373
Transferred over time	188,432		286,855		125,715		601,002
Total revenues	$	188,557	$	288,139	$	170,679	$	647,375

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BUSINESS COMBINATIONS (Tables)

9 Months Ended

Sep. 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:

	Nine Months Ended September 30,
	2022		2021
Purchase Price:
Cash used in acquisitions, net of cash acquired	$	72,731	$	150,364
Other non-cash consideration	1,220		—
Holdbacks to sellers and contingent consideration	4,112		4,865
Total consideration	$	78,063	$	155,229
Allocated as follows:
Current assets	$	7,599	$	7,260
Property, plant and equipment:
Land	3,141		803
Finance lease right-of-use-assets	—		31,467
Buildings and improvements	8,566		8,468
Machinery and equipment	10,296		42,458
Operating lease right-of-use assets	405		6,500
Intangible assets:
Trade names	—		8,350
Covenants not-to-compete	2,034		3,069
Customer relationships	11,417		30,340
Other non-current assets	40		—
Current liabilities	(3,721)		(5,952)
Other long-term liabilities	(123)		—
Financing lease liabilities, less current portion	—		(10,535)
Operating lease liabilities, less current portion	(282)		—
Fair value of assets acquired and liabilities assumed	39,372		122,228
Excess purchase price allocated to goodwill	$	38,691	$	33,001

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 September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Revenues	$	295,512	$	262,000	$	825,020	$	733,819
Operating income	$	36,247	$	28,516	$	79,473	$	64,360
Net income	$	22,635	$	15,308	$	44,888	$	27,993
Basic earnings per share attributable to common stockholders:
Weighted average common shares outstanding	51,677		51,389		51,604		51,312
Basic earnings per common share	$	0.44	$	0.30	$	0.87	$	0.55
Diluted earnings per share attributable to common stockholders:
Weighted average common shares outstanding	51,806		51,586		51,749		51,506
Diluted earnings per common share	$	0.44	$	0.30	$	0.87	$	0.54

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GOODWILL AND INTANGIBLE ASSETS (Tables)

9 Months Ended

Sep. 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		September 30, 2022
Eastern	$	52,072	$	93	$	241	$	52,406
Western	163,728		16,892		650		181,270
Resource Solutions	17,060		21,706		—		38,766
	$	232,860	$	38,691	$	891	$	272,442

Summary of Intangible Assets by Type

Summaries of intangible assets by type follows:

	Covenants Not-to-Compete		Customer Relationships		Trade Names		Total
Balance, September 30, 2022
Intangible assets	$	30,812	$	126,372	$	8,350	$	165,534
Less accumulated amortization	(23,609)		(43,254)		(3,879)		(70,742)
	$	7,203	$	83,118	$	4,471	$	94,792

	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 September 30, 2022
Fiscal year ending December 31, 2022	$	4,194
Fiscal year ending December 31, 2023	$	15,918
Fiscal year ending December 31, 2024	$	15,278
Fiscal year ending December 31, 2025	$	14,244
Fiscal year ending December 31, 2026	$	12,579
Thereafter	$	32,579

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ACCRUED FINAL CAPPING, CLOSURE AND POST CLOSURE (Tables)

9 Months Ended

Sep. 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:

	Nine Months Ended September 30,
	2022		2021
Beginning balance	$	86,914	$	82,533
Obligations incurred	3,592		3,638
Revision in estimates (1)	1,443		—
Accretion expense	5,685		5,496
Obligations settled (2)	(3,027)		(5,394)
Ending balance	$	94,607	$	86,273

(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)

9 Months Ended

Sep. 30, 2022

Debt And Derivatives Disclosure [Abstract]

Summary of Debt

A summary of debt is as follows:

	September 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 ("Revolving Credit Facility") due December 2026; 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%	49,070		45,724
Notes payable maturing through August 2024; bearing interest at a weighted average of 1.6%	712		4,846
Principal amount of debt	596,782		562,570
Less—unamortized debt issuance costs (1)	9,983		10,166
Debt less unamortized debt issuance costs	586,799		552,404
Less—current maturities of debt	8,337		9,901
	$	578,462	$	542,503

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

	September 30, 2022		December 31, 2021
Revolving Credit Facility and Term Loan Facility (collectively, the "Credit Facility")	$	5,011	$	5,884
New York Bonds 2014R-1	882		933
New York Bonds 2014R-2	223		268
New York Bonds 2020	1,150		1,283
FAME Bonds 2005R-3	198		262
FAME Bonds 2015R-1	361		413
FAME Bonds 2015R-2	212		268
Vermont Bonds 2013	392		433
Vermont Bonds 2022A-1	1,176		—
New Hampshire Bonds	378		422
	$	9,983	$	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	September 30, 2022		December 31, 2021
Interest rate swaps	Other current assets	$	3,526	$	—
Interest rate swaps	Other non-current assets	8,814		424
		$	12,340	$	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	$	12,340	$	(4,935)
Interest rate swaps - tax effect	Accumulated other comprehensive income (loss), net of tax	(4,410)		(168)
		$	7,930	$	(5,103)

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COMMITMENTS AND CONTINGENCIES (Tables)

9 Months Ended

Sep. 30, 2022

Commitments and Contingencies Disclosure [Abstract]

Summary of Environmental Liability

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

	Nine Months Ended September 30,
	2022		2021
Beginning balance	$	5,887	$	5,200
Accretion expense	79		82
Obligations incurred (1)	759		—
Obligations settled (2)	(353)		(281)
Ending balance	6,372		5,001
Less: current portion	646		375
Long-term portion	$	5,726	$	4,626

(1)Associated with the investigation of potential remediation at an inactive waste disposal site that adjoins one of the landfills that we operate.

(2)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)

9 Months Ended

Sep. 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	75	$	82.47
Exercised	(23)	$	8.56
Forfeited	—	$	—
Outstanding, September 30, 2022	129	$	55.60	7.4	$	3,148
Exercisable, September 30, 2022	49	$	12.88	3.5	$	3,105

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

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

	Restricted Stock Awards, 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	$	94.23
Class A Common Stock Vested	(65)	$	49.85
Forfeited	(34)	$	67.92
Outstanding, September 30, 2022	232	$	68.83	1.7	$	17,692
Unvested, September 30, 2022	416	$	68.95	1.4	$	31,751

(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	15,138
Amounts reclassified from accumulated other comprehensive income (loss)	2,136
Income tax provision related to items of other comprehensive income	(4,241)
Net current-period other comprehensive income	13,033
Balance, September 30, 2022	$	7,930

Summary of Reclassifications Out of Accumulated Other Comprehensive Loss

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

	Three Months Ended September 30,				Nine Months Ended September 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	$	14	$	1,204	$	2,136	$	3,551	Interest expense
	(14)		(1,204)		(2,136)		(3,551)		Income before income taxes
	—		(496)		(190)		(765)		Provision for income taxes
	$	(14)	$	(708)	$	(1,946)	$	(2,786)	Net income

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EARNINGS PER SHARE (Tables)

9 Months Ended

Sep. 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 September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Numerator:
Net income	$	22,672	$	15,861	$	44,658	$	31,955
Denominators:
Number of shares outstanding, end of period:
Class A common stock	50,692		50,410		50,692		50,410
Class B common stock	988		988		988		988
Unvested restricted stock	(1)		(2)		(1)		(2)
Effect of weighted average shares outstanding	(2)		(7)		(75)		(84)
Basic weighted average common shares outstanding	51,677		51,389		51,604		51,312
Impact of potentially dilutive securities:
Dilutive effect of stock options and other stock awards	129		197		145		194
Diluted weighted average common shares outstanding	51,806		51,586		51,749		51,506
Anti-dilutive potentially issuable shares	84		12		115		12

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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)

9 Months Ended

Sep. 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 September 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	$	1,705	$	—	$	—
Interest rate swaps	—		12,340		—
	$	1,705	$	12,340	$	—

	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)

9 Months Ended

Sep. 30, 2022

Segment Reporting [Abstract]

Summary of Segment Reporting Information by Segment

Three Months Ended September 30, 2022

Segment	Outside revenues		Inter-company revenues		Depreciation and amortization		Operating income (loss)		Total assets
Eastern	$	93,137	$	23,027	$	11,907	$	10,061	$	361,950
Western	121,903		40,703		16,778		22,405		725,232
Resource Solutions	80,228		1,579		3,138		4,526		189,854
Corporate Entities	—		—		704		(704)		122,311
Eliminations	—		(65,309)		—		—		—
	$	295,268	$	—	$	32,527	$	36,288	$	1,399,347

Three Months Ended September 30, 2021

Segment	Outside revenues		Inter-company revenues		Depreciation and amortization		Operating income (loss)		Total assets
Eastern	$	75,154	$	18,768	$	9,407	$	5,374	$	352,067
Western	103,523		35,523		15,710		15,805		673,608
Resource Solutions	63,292		156		1,903		6,679		126,529
Corporate Entities	—		—		471		(471)		128,193
Eliminations	—		(54,447)		—		—		—
	$	241,969	$	—	$	27,491	$	27,387	$	1,280,397

Nine Months Ended September 30, 2022

Segment	Outside revenues		Inter-company revenues		Depreciation and amortization		Operating income (loss)		Total assets
Eastern	$	251,720	$	61,842	$	34,895	$	13,981	$	361,950
Western	332,626		112,687		47,376		51,565		725,232
Resource Solutions	228,616		2,673		9,011		14,453		189,854
Corporate Entities	—		—		1,824		(1,824)		122,311
Eliminations	—		(177,202)		—		—		—
	$	812,962	$	—	$	93,106	$	78,175	$	1,399,347

Nine Months Ended September 30, 2021

Segment	Outside revenues		Inter-company revenues		Depreciation and amortization		Operating income (loss)		Total assets
Eastern	$	188,557	$	47,322	$	23,342	$	11,401	$	352,067
Western	288,139		97,771		44,838		38,462		673,608
Resource Solutions	170,679		3,337		5,020		12,792		126,529
Corporate Entities	—		—		1,310		(1,312)		128,193
Eliminations	—		(148,430)		—		—		—
	$	647,375	$	—	$	74,510	$	61,343	$	1,280,397

Summary of Revenue Attributable to Services

A summary of our revenues attributable to services provided follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2022		2021		2022		2021
Collection	$	144,117	$	118,872	$	400,910	$	323,667
Disposal	66,147		55,593		169,503		142,618
Power generation	1,643		1,253		6,050		3,657
Processing	3,133		2,959		7,883		6,754
Solid waste operations	215,040		178,677		584,346		476,696
Processing	32,159		27,418		93,421		65,721
Non-processing	48,069		35,874		135,195		104,958
Resource Solutions operations	80,228		63,292		228,616		170,679
Total revenues	$	295,268	$	241,969	$	812,962	$	647,375

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BASIS OF PRESENTATION (Details)	9 Months Ended
	Sep. 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		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Total revenues	$ 295,268	$ 241,969	$ 812,962	$ 647,375
Collection
Disaggregation of Revenue [Line Items]
Total revenues	144,117	118,872	400,910	323,667
Landfill
Disaggregation of Revenue [Line Items]
Total revenues	28,140	24,823	72,847	66,479
Transfer station
Disaggregation of Revenue [Line Items]
Total revenues	32,755	27,323	81,486	67,345
Transportation
Disaggregation of Revenue [Line Items]
Total revenues	5,252	3,447	15,170	8,794
Landfill gas-to-energy
Disaggregation of Revenue [Line Items]
Total revenues	1,643	1,253	6,050	3,657
Processing
Disaggregation of Revenue [Line Items]
Total revenues	35,292	30,377	101,304	72,475
Non-processing
Disaggregation of Revenue [Line Items]
Total revenues	48,069	35,874	135,195	104,958
Transferred at a point-in-time
Disaggregation of Revenue [Line Items]
Total revenues	12,934	20,266	48,098	46,373
Transferred over time
Disaggregation of Revenue [Line Items]
Total revenues	282,334	221,703	764,864	601,002
Eastern
Disaggregation of Revenue [Line Items]
Total revenues	93,137	75,154	251,720	188,557
Eastern | Collection
Disaggregation of Revenue [Line Items]
Total revenues	61,875	48,951	172,671	124,389
Eastern | Landfill
Disaggregation of Revenue [Line Items]
Total revenues	7,900	6,622	19,819	18,143
Eastern | Transfer station
Disaggregation of Revenue [Line Items]
Total revenues	19,525	16,948	48,431	39,847
Eastern | Transportation
Disaggregation of Revenue [Line Items]
Total revenues	1,233	54	4,470	148
Eastern | Landfill gas-to-energy
Disaggregation of Revenue [Line Items]
Total revenues	205	269	727	784
Eastern | Processing
Disaggregation of Revenue [Line Items]
Total revenues	2,399	2,310	5,602	5,246
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	115	43	352	125
Eastern | Transferred over time
Disaggregation of Revenue [Line Items]
Total revenues	93,022	75,111	251,368	188,432
Western
Disaggregation of Revenue [Line Items]
Total revenues	121,903	103,523	332,626	288,139
Western | Collection
Disaggregation of Revenue [Line Items]
Total revenues	82,242	69,921	228,239	199,278
Western | Landfill
Disaggregation of Revenue [Line Items]
Total revenues	20,240	18,201	53,028	48,336
Western | Transfer station
Disaggregation of Revenue [Line Items]
Total revenues	13,230	10,375	33,055	27,498
Western | Transportation
Disaggregation of Revenue [Line Items]
Total revenues	4,019	3,393	10,700	8,646
Western | Landfill gas-to-energy
Disaggregation of Revenue [Line Items]
Total revenues	1,438	984	5,323	2,873
Western | Processing
Disaggregation of Revenue [Line Items]
Total revenues	734	649	2,281	1,508
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	439	296	1,467	1,284
Western | Transferred over time
Disaggregation of Revenue [Line Items]
Total revenues	121,464	103,227	331,159	286,855
Resource Solutions
Disaggregation of Revenue [Line Items]
Total revenues	80,228	63,292	228,616	170,679
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 station
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	32,159	27,418	93,421	65,721
Resource Solutions | Non-processing
Disaggregation of Revenue [Line Items]
Total revenues	48,069	35,874	135,195	104,958
Resource Solutions | Transferred at a point-in-time
Disaggregation of Revenue [Line Items]
Total revenues	12,380	19,927	46,279	44,964
Resource Solutions | Transferred over time
Disaggregation of Revenue [Line Items]
Total revenues	$ 67,848	$ 43,365	$ 182,337	$ 125,715

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REVENUE RECOGNITION - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Rebates	$ (295,268,000)	$ (241,969,000)	$ (812,962,000)	$ (647,375,000)
Revenue recognized fro performance obligation satisfied in previous period	0	0	0	0
Gross receivables from contracts	111,256,000		111,256,000		$ 89,232,000
Contract liabilities	3,891,000		3,891,000		$ 3,404,000
Rebate for Recycled or Returned Organic Materials
Disaggregation of Revenue [Line Items]
Rebates	$ 5,460,000	$ 4,341,000	$ 15,162,000	$ 8,440,000

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BUSINESS COMBINATIONS - Narrative (Details) - business	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Business Acquisition [Line Items]
Number of businesses acquired	12	8
Minimum
Business Acquisition [Line Items]
Useful life of finite lived intangible assets (in years)	2 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	6	2

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BUSINESS COMBINATIONS - Summary of Purchase Price Paid for Acquisitions (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Purchase Price:
Cash used in acquisitions, net of cash acquired	$ 73,963	$ 153,112
Allocated as follows:
Excess purchase price allocated to goodwill	272,442		$ 232,860
Waste Collection Acquisitions
Purchase Price:
Cash used in acquisitions, net of cash acquired	72,731	150,364
Other non-cash consideration	1,220	0
Holdbacks to sellers and contingent consideration	4,112	4,865
Total consideration	78,063	155,229
Allocated as follows:
Current assets	7,599	7,260
Land	3,141	803
Finance lease right-of-use-assets	0	31,467
Buildings and improvements	8,566	8,468
Machinery and equipment	10,296	42,458
Operating lease right-of-use assets	405	6,500
Other non-current assets	40	0
Current liabilities	(3,721)	(5,952)
Other long-term liabilities	(123)	0
Financing lease liabilities, less current portion	0	(10,535)
Operating lease liabilities, less current portion	(282)	0
Fair value of assets acquired and liabilities assumed	39,372	122,228
Excess purchase price allocated to goodwill	38,691	33,001
Waste Collection Acquisitions | Trade Names
Allocated as follows:
Intangible assets:	0	8,350
Waste Collection Acquisitions | Covenants not-to-compete
Allocated as follows:
Intangible assets:	2,034	3,069
Waste Collection Acquisitions | Customer Relationships
Allocated as follows:
Intangible assets:	$ 11,417	$ 30,340

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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		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Business Combination and Asset Acquisition [Abstract]
Revenues	$ 295,512	$ 262,000	$ 825,020	$ 733,819
Operating income	36,247	28,516	79,473	64,360
Net income	$ 22,635	$ 15,308	$ 44,888	$ 27,993
Weighted average common shares outstanding, basic (in shares)	51,677	51,389	51,604	51,312
Basic earnings per common share (in dollars per share)	$ 0.44	$ 0.30	$ 0.87	$ 0.55
Weighted average common shares outstanding, diluted (in shares)	51,806	51,586	51,749	51,506
Diluted earnings per common share (in dollars per share)	$ 0.44	$ 0.30	$ 0.87	$ 0.54

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GOODWILL AND INTANGIBLE ASSETS - Summary of Goodwill Activity (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 232,860
Acquisitions	38,691
Adjustments to Acquisitions	891
Goodwill, ending balance	272,442
Eastern
Goodwill [Roll Forward]
Goodwill, beginning balance	52,072
Acquisitions	93
Adjustments to Acquisitions	241
Goodwill, ending balance	52,406
Western
Goodwill [Roll Forward]
Goodwill, beginning balance	163,728
Acquisitions	16,892
Adjustments to Acquisitions	650
Goodwill, ending balance	181,270
Resource Solutions
Goodwill [Roll Forward]
Goodwill, beginning balance	17,060
Acquisitions	21,706
Adjustments to Acquisitions	0
Goodwill, ending balance	$ 38,766

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GOODWILL AND INTANGIBLE ASSETS - Summary of Intangible Assets by Type (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Intangible assets	$ 165,534	$ 152,132
Less accumulated amortization	(70,742)	(58,409)
Intangible assets, net	94,792	93,723
Covenants not-to-compete
Finite-Lived Intangible Assets [Line Items]
Intangible assets	30,812	28,777
Less accumulated amortization	(23,609)	(22,148)
Intangible assets, net	7,203	6,629
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets	126,372	115,005
Less accumulated amortization	(43,254)	(34,809)
Intangible assets, net	83,118	80,196
Trade Names
Finite-Lived Intangible Assets [Line Items]
Intangible assets	8,350	8,350
Less accumulated amortization	(3,879)	(1,452)
Intangible assets, net	$ 4,471	$ 6,898

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GOODWILL AND INTANGIBLE ASSETS - Narrative (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible amortization expense	$ 4,281	$ 3,133	$ 12,333	$ 7,175

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GOODWILL AND INTANGIBLE ASSETS - Summary of Intangible Amortization Expense Estimated (Detail) $ in Thousands	Sep. 30, 2022 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Fiscal year ending December 31, 2022	$ 4,194
Fiscal year ending December 31, 2023	15,918
Fiscal year ending December 31, 2024	15,278
Fiscal year ending December 31, 2025	14,244
Fiscal year ending December 31, 2026	12,579
Thereafter	$ 32,579

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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	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Beginning balance	$ 86,914	$ 82,533
Obligations incurred	3,592	3,638
Revision in estimates	1,443	0
Accretion expense	5,685	5,496
Obligations settled	(3,027)	(5,394)
Ending balance	$ 94,607	$ 86,273

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DEBT - Summary of Debt (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 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%	$ 49,070	$ 45,724
Principal amount of debt	596,782	562,570
Less - unamortized debt issuance costs	9,983	10,166
Debt less unamortized debt issuance costs	586,799	552,404
Less—current maturities of debt	8,337	9,901
Debt, less current portion	$ 578,462	$ 542,503
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Debt, less current portion	Debt, less current portion
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 ("Revolving Credit Facility") due December 2026; bearing interest at LIBOR plus 1.375%
Debt Instrument [Line Items]
Principal amount of debt	$ 0	0
Line of Credit | Revolving credit facility ("Revolving Credit 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%
Credit Facility | Revolving Credit Facility and Term Loan Facility (collectively, the "Credit Facility")
Debt Instrument [Line Items]
Less - unamortized debt issuance costs	$ 5,011	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	$ 882	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	$ 223	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	$ 1,150	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	$ 198	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	$ 361	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	$ 212	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	$ 392	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	$ 1,176	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	$ 378	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	$ 712	$ 4,846

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DEBT - Financing Activities and Credit Facility Narrative (Details)	9 Months Ended
	Sep. 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%
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 ("Revolving Credit Facility") due December 2026; 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 ("Revolving Credit Facility") due December 2026; 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	Sep. 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	Sep. 30, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Accumulated other comprehensive income (loss), net of tax	$ 7,930	$ (5,103)
Designated as Hedging Instrument | Interest rate swaps
Derivatives, Fair Value [Line Items]
Cash flow hedge derivatives, gross asset	12,340	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	12,340	(4,935)
Accumulated other comprehensive income (loss), tax	(4,410)	(168)
Accumulated other comprehensive income (loss), net of tax	7,930	(5,103)
Other current assets | Designated as Hedging Instrument | Interest rate swaps
Derivatives, Fair Value [Line Items]
Cash flow hedge derivatives, gross asset	3,526	0
Other non-current assets | Designated as Hedging Instrument | Interest rate swaps
Derivatives, Fair Value [Line Items]
Cash flow hedge derivatives, gross asset	8,814	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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COMMITMENTS AND CONTINGENCIES - Narrative (Detail) $ in Thousands	Sep. 30, 2022 USD ($)
Loss Contingencies [Line Items]
Loss contingency accrual	$ 1,071
Minimum
Loss Contingencies [Line Items]
Risk free interest (as a percent)	1.50%
Maximum
Loss Contingencies [Line Items]
Risk free interest (as a percent)	4.10%

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COMMITMENTS AND CONTINGENCIES - Environmental Remediation Liability (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Accrual for Environmental Loss Contingencies [Roll Forward]
Beginning balance	$ 5,887	$ 5,200
Obligations settled	(353)	(281)
Ending balance	6,372	5,001
Less: current portion	646	375
Long-term portion	5,726	4,626
Other environmental remediation sites
Accrual for Environmental Loss Contingencies [Roll Forward]
Accretion expense	79	82
Inactive waste disposal site
Accrual for Environmental Loss Contingencies [Roll Forward]
Accretion expense	$ 759	$ 0

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STOCKHOLDERS' EQUITY - Narrative (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Limited Partners' Capital Account [Line Items]
Unrecognized stock-based compensation, weighted average period			4 years 8 months 12 days
Fair value of stock awards vested	$ 218,000		$ 5,577,000
Stock Options
Limited Partners' Capital Account [Line Items]
Stock-based compensation expense	89,000	$ 11,000	122,000	$ 11,000
Unrecognized stock-based compensation expense, stock options	2,225,000		2,225,000
Aggregate intrinsic value of options exercised	0		1,467,000
Restricted Stock Awards, Restricted Stock Units And Performance Stock Units
Limited Partners' Capital Account [Line Items]
Stock-based compensation expense	2,225,000	2,576,000	5,204,000	8,505,000
Restricted Stock
Limited Partners' Capital Account [Line Items]
Unrecognized stock-based compensation expense	46,000		$ 46,000
Restricted Stock | Non Employee Director
Limited Partners' Capital Account [Line Items]
Award vesting period			3 years
Restricted Stock Unit
Limited Partners' Capital Account [Line Items]
Unrecognized stock-based compensation expense	4,611,000		$ 4,611,000
Restricted Stock Unit | Non Employee Director
Limited Partners' Capital Account [Line Items]
Award service period			3 years
Performance Stock Unit
Limited Partners' Capital Account [Line Items]
Unrecognized stock-based compensation expense	5,592,000		$ 5,592,000
Weighted average | Restricted Stock
Limited Partners' Capital Account [Line Items]
Unrecognized stock-based compensation, weighted average period			1 year 3 months 18 days
Weighted average | Restricted Stock Unit
Limited Partners' Capital Account [Line Items]
Unrecognized stock-based compensation, weighted average period			1 year 9 months 18 days
Weighted average | Performance Stock Unit
Limited Partners' Capital Account [Line Items]
Unrecognized stock-based compensation, weighted average period			1 year 7 months 6 days
2016 Plan
Limited Partners' Capital Account [Line Items]
Expiration period			10 years
2016 Plan | Minimum
Limited Partners' Capital Account [Line Items]
Award vesting period			1 year
2016 Plan | Maximum
Limited Partners' Capital Account [Line Items]
Award vesting period			5 years
Amended and Restated 1997 Employee Stock Purchase Plan
Limited Partners' Capital Account [Line Items]
Stock-based compensation expense	$ 97,000	$ 67,000	$ 262,000	$ 196,000
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)	793,000		793,000
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	9 Months Ended
	Sep. 30, 2022 USD ($) $ / shares shares
Stock Options
Beginning balance, outstanding (in shares) | shares	77
Granted (in shares) | shares	75
Exercised (in shares) | shares	(23)
Forfeited (in shares) | shares	0
Ending balance, outstanding (in shares) | shares	129
Exercisable at end of period (in shares) | shares	49
Weighted Average Exercise Price
Beginning balance, outstanding (in dollars per share) | $ / shares	$ 15.68
Granted (in dollars per share) | $ / shares	82.47
Exercised (in dollars per share) | $ / shares	8.56
Forfeited (in dollars per share) | $ / shares	0
Ending balance, outstanding (in dollars per share) | $ / shares	55.60
Exercisable at end of period (in dollars per share) | $ / shares	$ 12.88
Weighted Average Remaining Contractual Term (years) and Aggregate Intrinsic Value
Outstanding contractual term	7 years 4 months 24 days
Exercisable contractual term	3 years 6 months
Outstanding aggregate intrinsic value | $	$ 3,148
Exercisable aggregate intrinsic value | $	$ 3,105

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STOCKHOLDERS' EQUITY - Summary of Restricted Stock Awards, Restricted Stock Unit and Performance-based Stock Unit Activity (Detail) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 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 Awards, 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)	232
Weighted Average Grant Date Fair Value
Outstanding at beginning of period (in dollars per share) | $ / shares	$ 55.40
Granted (in dollars per share) | $ / shares	94.23
Forfeited (in dollars per share) | $ / shares	67.92
Outstanding at end of period (in dollars per share) | $ / shares	$ 68.83
Weighted Average Remaining Contractual Term (years) and Aggregate Intrinsic Value
Contractual term (in years)	1 year 8 months 12 days
Aggregate intrinsic value | $	$ 17,692
Restricted Stock Awards, Restricted Stock Units And Performance Stock Units | Class A Common Stock
Restricted Stock, Restricted Stock Units, and Performance Stock Units
Vested (in shares)	(65)
Weighted Average Grant Date Fair Value
Class A Common Stock Vested (in dollars per share) | $ / shares	$ 49.85
Unvested | Restricted Stock Awards, Restricted Stock Units And Performance Stock Units
Restricted Stock, Restricted Stock Units, and Performance Stock Units
Outstanding, end of period (in shares)	416
Weighted Average Grant Date Fair Value
Outstanding at end of period (in dollars per share) | $ / shares	$ 68.95
Weighted Average Remaining Contractual Term (years) and Aggregate Intrinsic Value
Contractual term (in years)	1 year 4 months 24 days
Aggregate intrinsic value | $	$ 31,751

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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						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 457,566	$ 435,050	$ 422,457	$ 388,492	$ 373,336	$ 362,142	$ 422,457	$ 362,142
Other comprehensive income, net of tax	3,910	2,980	6,143	892	(235)	3,830	13,033	4,487
Ending balance	486,559	$ 457,566	435,050	$ 407,951	$ 388,492	$ 373,336	486,559	$ 407,951
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							15,138
Amounts reclassified from accumulated other comprehensive income (loss)							2,136
Income tax provision related to items of other comprehensive income							(4,241)
Other comprehensive income, net of tax							13,033
Ending balance	$ 7,930						$ 7,930

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STOCKHOLDERS' EQUITY - Summary of Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ 6,177			$ 5,164			$ 17,078	$ 15,928
Income before income taxes	31,812			22,462			63,335	46,431
Provision for income taxes	9,140			6,601			18,677	14,476
Net income	22,672	$ 17,796	$ 4,190	15,861	$ 11,783	$ 4,311	44,658	31,955
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	(14)			(1,204)			(2,136)	(3,551)
Provision for income taxes	0			(496)			(190)	(765)
Net income	(14)			(708)			(1,946)	(2,786)
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	$ 14			$ 1,204			$ 2,136	$ 3,551

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EARNINGS PER SHARE (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Numerator:
Net income	$ 22,672	$ 15,861	$ 44,658	$ 31,955
Denominators:
Unvested restricted stock (in shares)	(1,000)	(2,000)	(1,000)	(2,000)
Effect of weighted average shares outstanding (in shares)	(2,000)	(7,000)	(75,000)	(84,000)
Weighted average common shares outstanding, basic (in shares)	51,677,000	51,389,000	51,604,000	51,312,000
Impact of potentially dilutive securities:
Dilutive effect of stock options and other stock awards (in shares)	129,000	197,000	145,000	194,000
Weighted average common shares outstanding, diluted	51,806,000	51,586,000	51,749,000	51,506,000
Anti-dilutive potentially issuable shares (in shares)	84,000	12,000	115,000	12,000
Class A Common Stock
Denominators:
Common stock, shares outstanding (in shares)	50,692,000	50,410,000	50,692,000	50,410,000	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		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Unusual or Infrequent Items, or Both [Abstract]
Expense from acquisition activities	$ 816	$ 1,904	$ 3,878	$ 3,950
Environmental remediation charge	$ 759	$ 0	$ 759	$ 0

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FAIR VALUE OF FINANCIAL INSTRUMENTS - Recurring Fair Value Measurements (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Assets:
Restricted investment securities - landfill closure	$ 1,705	$ 2,122
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Interest rate swaps	0	0
Total assets	1,705	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	1,705	2,122
Recurring | Significant Other Observable Inputs (Level 2)
Assets:
Interest rate swaps	12,340	424
Total assets	12,340	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 ($)	Sep. 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	$ 350,000,000	$ 350,000,000
Fair Value | Fixed Rate Bonds
Debt Instrument [Line Items]
Fixed rate debt	185,533,000
Carrying Value
Debt Instrument [Line Items]
Revolving credit facility	0
Carrying Value | Fixed Rate Bonds
Debt Instrument [Line Items]
Fixed rate debt	$ 197,000,000

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SEGMENT REPORTING - Summary of Financial Information by Reportable Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Segment Reporting Information [Line Items]
Revenues	$ 295,268	$ 241,969	$ 812,962	$ 647,375
Depreciation and amortization	32,527	27,491	93,106	74,510
Operating income (loss)	36,288	27,387	78,175	61,343
Total assets	1,399,347	1,280,397	1,399,347	1,280,397	$ 1,283,580
Operating | Eastern
Segment Reporting Information [Line Items]
Revenues	93,137	75,154	251,720	188,557
Depreciation and amortization	11,907	9,407	34,895	23,342
Operating income (loss)	10,061	5,374	13,981	11,401
Total assets	361,950	352,067	361,950	352,067
Operating | Western
Segment Reporting Information [Line Items]
Revenues	121,903	103,523	332,626	288,139
Depreciation and amortization	16,778	15,710	47,376	44,838
Operating income (loss)	22,405	15,805	51,565	38,462
Total assets	725,232	673,608	725,232	673,608
Operating | Resource Solutions
Segment Reporting Information [Line Items]
Revenues	80,228	63,292	228,616	170,679
Depreciation and amortization	3,138	1,903	9,011	5,020
Operating income (loss)	4,526	6,679	14,453	12,792
Total assets	189,854	126,529	189,854	126,529
Corporate Entities
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Depreciation and amortization	704	471	1,824	1,310
Operating income (loss)	(704)	(471)	(1,824)	(1,312)
Total assets	122,311	128,193	122,311	128,193
Inter-company revenues
Segment Reporting Information [Line Items]
Revenues	(65,309)	(54,447)	(177,202)	(148,430)
Inter-company revenues | Eastern
Segment Reporting Information [Line Items]
Revenues	(23,027)	(18,768)	(61,842)	(47,322)
Inter-company revenues | Western
Segment Reporting Information [Line Items]
Revenues	(40,703)	(35,523)	(112,687)	(97,771)
Inter-company revenues | Resource Solutions
Segment Reporting Information [Line Items]
Revenues	$ (1,579)	$ (156)	$ (2,673)	$ (3,337)

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SEGMENT REPORTING - Summary of Revenues Attributable to Services Provided by Company (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenue from External Customer [Line Items]
Revenues	$ 295,268	$ 241,969	$ 812,962	$ 647,375
Solid waste operations
Revenue from External Customer [Line Items]
Revenues	215,040	178,677	584,346	476,696
Collection
Revenue from External Customer [Line Items]
Revenues	144,117	118,872	400,910	323,667
Disposal
Revenue from External Customer [Line Items]
Revenues	66,147	55,593	169,503	142,618
Power generation
Revenue from External Customer [Line Items]
Revenues	1,643	1,253	6,050	3,657
Processing
Revenue from External Customer [Line Items]
Revenues	3,133	2,959	7,883	6,754
Resource Solutions operations
Revenue from External Customer [Line Items]
Revenues	80,228	63,292	228,616	170,679
Processing
Revenue from External Customer [Line Items]
Revenues	32,159	27,418	93,421	65,721
Non-processing
Revenue from External Customer [Line Items]
Revenues	$ 48,069	$ 35,874	$ 135,195	$ 104,958