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DEBT - Components of Debt (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Sep. 02, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Weighted-average discount rate - finance leases	3.60%
Finance leases maturing through December 2107; bearing interest at a weighted average of 3.6%	$ 45,724	$ 31,486
Principal amount of debt	562,570	548,419
Less—unamortized discount and debt issuance costs	10,166	8,768
Debt less unamortized debt issuance costs	552,404	539,651
Less—current maturities of debt	9,901	9,240
Debt, less current portion	$ 542,503	$ 530,411
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Debt, less current portion	Debt, less current portion
Line of Credit | Amended and Restated Revolving Credit Facility due December 2026 ("Revolving Credit Facility"); bearing interest at LIBOR plus 1.375%
Debt Instrument [Line Items]
Principal amount of debt	$ 0	$ 0
Line of Credit | Revolving Credit Facility due May 2023 amended and restated in December 2021; bore interest at LIBOR plus 1.75%
Debt Instrument [Line Items]
Basis spread on variable rate	1.75%
Principal amount of debt	$ 0	0
Secured Debt | Amended and Restated Term Loan A Facility due December 2026 ("Term Loan Facility"); bearing interest at LIBOR plus 1.375%
Debt Instrument [Line Items]
Principal amount of debt	$ 350,000	0
Secured Debt | Term Loan A Facility due May 2023 amended and restated in December 2021; bore interest at LIBOR plus 1.75%
Debt Instrument [Line Items]
Basis spread on variable rate	1.75%
Principal amount of debt	$ 0	350,000
Credit Facility | Amended and Restated Revolving Credit Facility and Term Loan Facility (collectively, the "Credit Facility")
Debt Instrument [Line Items]
Less—unamortized discount and debt issuance costs	5,884	0
Credit Facility | Revolving Credit Facility and Term Loan A Facility amended and restated in December 2021
Debt Instrument [Line Items]
Less—unamortized discount and debt issuance costs	$ 0	3,839
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%			2.875%
Principal amount of debt	$ 25,000	25,000
Less—unamortized discount and debt issuance costs	$ 933	1,000
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%			3.125%
Principal amount of debt	$ 15,000	15,000
Less—unamortized discount and debt issuance costs	$ 268	329
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%		2.75%
Principal amount of debt	$ 40,000	40,000
Less—unamortized discount and debt issuance costs	$ 1,283	1,461
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 discount and debt issuance costs	$ 262	347
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 discount and debt issuance costs	$ 413	482
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 discount and debt issuance costs	$ 268	343
Unsecured Debt | Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2013 ("Vermont Bonds") due April 2036 - fixed rate interest period through 2028; bearing interest at 4.625%
Debt Instrument [Line Items]
Stated interest rate	4.625%
Principal amount of debt	$ 16,000	16,000
Less—unamortized discount and debt issuance costs	$ 433	487
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 discount and debt issuance costs	$ 422	480
Notes payable maturing through June 2027; bearing interest at a weighted average of 3.1%
Debt Instrument [Line Items]
Weighted average interest rate	3.10%
Principal amount of debt	$ 4,846	$ 4,933
LIBOR | Line of Credit | Amended and Restated Revolving Credit Facility due December 2026 ("Revolving Credit Facility"); bearing interest at LIBOR plus 1.375%
Debt Instrument [Line Items]
Basis spread on variable rate	1.375%
LIBOR | Secured Debt | Amended and Restated Term Loan A Facility due December 2026 ("Term Loan Facility"); bearing interest at LIBOR plus 1.375%
Debt Instrument [Line Items]
Basis spread on variable rate	1.375%

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Amount of short-term and long-term debt and lease obligation.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Weighted average interest rate of debt outstanding.

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Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Present value of lessee's discounted obligation for lease payments from finance lease.

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