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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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