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LONG TERM DEBT AND CAPITAL LEASES - Tax-Exempt Financings (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Debt Instrument [Line Items] |  |
Aggregate principal amount | $ 497,680,000 | $ 525,583,000
New York Bonds, 2016 |  |
Debt Instrument [Line Items] |  |
Principal amount |  | 15,000,000
New York Bonds, 2014 |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount | $ 40,000,000 |
Debt instrument interest rate | 3.75% |
New York State Environmental Facilities Corporation Solid Waste Disposal Revenue Bonds Series 2014R-2 due December 2044 - fixed rate interest period through 2026; bearing interest at 3.125% |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate | 3.125% |
Aggregate principal amount | $ 15,000,000 | 15,000,000
Unsecured Debt | Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-1; letter of credit backed due January 2025 - bore interest at SIFMA Index |  |
Debt Instrument [Line Items] |  |
Principal amount | 3,600,000 |
Unsecured Debt | Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-2 due January 2025 - fixed rate interest period through 2017; bore interest at 6.25% |  |
Debt Instrument [Line Items] |  |
Principal amount | 21,400,000 |
Unsecured Debt | Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2005R-3 due January 2025 - fixed rate interest period through 2025; bearing interest at 5.25% |  |
Debt Instrument [Line Items] |  |
Principal amount | $ 25,000,000 |
Debt instrument interest rate | 5.25% |
Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2013 due April 2036 - fixed rate interest period through 2018; bearing interest at 4.75% |  |
Debt Instrument [Line Items] |  |
Debt instrument interest rate | 5.125% |
Aggregate principal amount | $ 15,000,000 | $ 15,000,000
Additional bond issued | 15,000,000 |
Fixed Rate Bonds | Vermont Bonds |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount | $ 16,000,000 |
Debt instrument interest rate | 4.75% |
New Hampshire Bonds |  |
Debt Instrument [Line Items] |  |
Aggregate principal amount | $ 11,000,000 |
Debt instrument interest rate | 4.00% |

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