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DEBT - Tax-Exempt Financings (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2020	Sep. 02, 2020	Dec. 31, 2019
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]
Aggregate principal amount issued			$ 40,000,000
Stated interest rate		2.75%	2.75%
Aggregate principal amount outstanding		$ 40,000,000		$ 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]
Aggregate principal amount issued				$ 25,000,000
Stated interest rate		2.875%		2.875%
Aggregate principal amount outstanding		$ 25,000,000		$ 25,000,000
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%
Aggregate principal amount outstanding		$ 15,000,000		$ 15,000,000
Unsecured Debt | Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2015R-2 due August 2035 - fixed rate interest period through 2025; bearing interest at 4.375%
Debt Instrument [Line Items]
Aggregate principal amount issued	$ 15,000,000
Stated interest rate	4.375%	4.375%
Aggregate principal amount outstanding		$ 15,000,000		15,000,000
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%
Aggregate principal amount outstanding		$ 25,000,000		25,000,000
Unsecured Debt | Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2015 (FAME Bonds 2015R-1)
Debt Instrument [Line Items]
Stated interest rate	5.125%
Aggregate principal amount outstanding		15,000,000
Unsecured Debt | Vermont Economic Development Authority Solid Waste Disposal Revenue Bonds
Debt Instrument [Line Items]
Debt instrument, interest rate during period	4.625%
Fixed Rate Bonds | Vermont Bonds
Debt Instrument [Line Items]
Aggregate principal amount issued	$ 16,000,000
Stated interest rate	4.75%
Aggregate principal amount outstanding		16,000,000
New Hampshire Bonds
Debt Instrument [Line Items]
Aggregate principal amount issued				$ 11,000,000
Stated interest rate				2.95%
Aggregate principal amount outstanding		$ 11,000,000

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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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Face (par) amount of debt instrument at time of issuance.

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