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DEBT - Tax-Exempt Financings (Details) | 12 Months Ended
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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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