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DEBT - Components of Debt (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
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%	$ 49,813	$ 45,724
Principal amount of debt	603,477	562,570
Less—unamortized discount and debt issuance costs	9,494	10,166
Debt less unamortized debt issuance costs	593,983	552,404
Less—current maturities of debt	8,968	9,901
Debt, less current portion	$ 585,015	$ 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; bore interest at LIBOR plus 1.125%
Debt Instrument [Line Items]
Principal amount of debt	$ 350,000	$ 350,000
Line of Credit | Revolving Credit Facility ("Revolving Credit Facility") due December 2026; bore interest at LIBOR plus 1.125%
Debt Instrument [Line Items]
Principal amount of debt	$ 6,000	0
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 discount and debt issuance costs	$ 866	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 discount and debt issuance costs	$ 207	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%		2.75%
Principal amount of debt	$ 40,000	40,000
Less—unamortized discount and debt issuance costs	$ 1,106	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 discount and debt issuance costs	$ 176	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 discount and debt issuance costs	$ 344	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 discount and debt issuance costs	$ 193	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 discount and debt issuance costs	$ 378	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 discount and debt issuance costs	$ 1,144	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 discount and debt issuance costs	$ 364	422
Notes payable maturing through August 2024; bearing interest at a weighted average of 1.7%
Debt Instrument [Line Items]
Weighted average interest rate	1.70%
Principal amount of debt	$ 664	4,846
Credit Facility | Revolving Credit Facility and Term Loan Facility (collectively, the "Credit Facility")
Debt Instrument [Line Items]
Less—unamortized discount and debt issuance costs	$ 4,716	$ 5,884
LIBOR | Secured Debt | Term Loan A Facility ("Term Loan Facility") due December 2026; bore interest at LIBOR plus 1.125%
Debt Instrument [Line Items]
Basis spread on variable rate	1.125%
LIBOR | Line of Credit | Revolving Credit Facility ("Revolving Credit Facility") due December 2026; bore interest at LIBOR plus 1.125%
Debt Instrument [Line Items]
Basis spread on variable rate	1.125%

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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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