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DEBT - Tax-Exempt Financings (Details)	12 Months Ended
	Dec. 31, 2019 USD ($)
Unsecured Debt | New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014 ("New York Bonds 2014") 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
Aggregate principal amount outstanding	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]
Aggregate principal amount outstanding	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
Aggregate principal amount outstanding	$ 15,000,000
Stated interest rate	4.375%
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]
Aggregate principal amount outstanding	$ 25,000,000
Stated interest rate	5.25%
Unsecured Debt | Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2015 (FAME Bonds 2015R-1)
Debt Instrument [Line Items]
Aggregate principal amount outstanding	$ 15,000,000
Stated interest rate	5.125%
Unsecured Debt | Vermont Economic Development Authority Solid Waste Disposal Revenue Bonds
Debt Instrument [Line Items]
Debt instrument, interest rate during period	4.625%
New York Bonds, 2014R-1
Debt Instrument [Line Items]
Stated interest rate	2.875%
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]
Aggregate principal amount outstanding	$ 15,000,000
Stated interest rate	3.125%
Fixed Rate Bonds | Vermont Bonds
Debt Instrument [Line Items]
Aggregate principal amount issued	$ 16,000,000
Aggregate principal amount outstanding	$ 16,000,000
Stated interest rate	4.75%
New Hampshire Bonds
Debt Instrument [Line Items]
Aggregate principal amount issued	$ 11,000,000
Aggregate principal amount outstanding	$ 11,000,000
Stated interest rate	2.95%

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