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DEBT - Components of Debt (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Sep. 02, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Weighted-average discount rate - finance leases	4.20%
Finance leases maturing through December 2107; bearing interest at a weighted average of 4.2%	$ 31,486		$ 18,364
Principal amount of debt	548,419		522,728
Less—unamortized discount and debt issuance costs	8,768		9,406
Debt less unamortized discount and debt issuance costs	539,651		513,322
Less—current maturities of debt	9,240		4,301
Debt, less current portion	530,411		509,021
Revolving Credit Facility due May 2023 ("Revolving Credit Facility"); bearing interest at LIBOR plus 1.75%
Debt Instrument [Line Items]
Principal amount of debt	0		26,900
Secured Debt | Term Loan A Facility due May 2023 ("Term Loan Facility"); bearing interest at LIBOR plus 1.75%
Debt Instrument [Line Items]
Principal amount of debt	350,000		350,000
Credit Facility
Debt Instrument [Line Items]
Less—unamortized discount and debt issuance costs	$ 3,839		$ 5,478
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	$ 1,000		$ 1,057
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	$ 329		390
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		0
Less—unamortized discount and debt issuance costs	$ 1,461		0
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%			5.25%
Principal amount of debt	$ 25,000		25,000
Less—unamortized discount and debt issuance costs	$ 347		432
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	$ 482		552
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%			4.375%
Principal amount of debt	$ 15,000		15,000
Less—unamortized discount and debt issuance costs	$ 343		417
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	$ 487		541
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	$ 480		539
Notes payable maturing through June 2027; bearing interest at a weighted average of 3.5%
Debt Instrument [Line Items]
Weighted average interest rate	3.50%
Principal amount of debt	$ 4,933		$ 5,464
LIBOR | Revolving Credit Facility due May 2023 ("Revolving Credit Facility"); bearing interest at LIBOR plus 1.75%
Debt Instrument [Line Items]
Basis spread on variable rate	1.75%
LIBOR | Secured Debt | Term Loan A Facility due May 2023 ("Term Loan Facility"); bearing interest at LIBOR plus 1.75%
Debt Instrument [Line Items]
Basis spread on variable rate	1.75%

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- Definition

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

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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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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