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DEBT - Components of Debt (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Sep. 02, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |  |
Weighted-average discount rate - finance leases | 4.20% |  |  |
Finance leases maturing through December 2107; bearing interest at a weighted average of 4.2% | $ 31,486 |  | $ 18,364 |
Principal amount of debt | 548,419 |  | 522,728 |
Less—unamortized discount and debt issuance costs | 8,768 |  | 9,406 |
Debt less unamortized discount and debt issuance costs | 539,651 |  | 513,322 |
Less—current maturities of debt | 9,240 |  | 4,301 |
Debt, less current portion | 530,411 |  | 509,021 |
Revolving Credit Facility due May 2023 ("Revolving Credit Facility"); bearing interest at LIBOR plus 1.75% |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount of debt | 0 |  | 26,900 |
Secured Debt | Term Loan A Facility due May 2023 ("Term Loan Facility"); bearing interest at LIBOR plus 1.75% |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount of debt | 350,000 |  | 350,000 |
Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Less—unamortized discount and debt issuance costs | $ 3,839 |  | $ 5,478 |
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] |  |  |  |
Stated interest rate | 2.875% |  | 2.875% |
Principal amount of debt | $ 25,000 |  | $ 25,000 |
Less—unamortized discount and debt issuance costs | $ 1,000 |  | $ 1,057 |
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% |
Principal amount of debt | $ 15,000 |  | $ 15,000 |
Less—unamortized discount and debt issuance costs | $ 329 |  | 390 |
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] |  |  |  |
Stated interest rate | 2.75% | 2.75% |  |
Principal amount of debt | $ 40,000 |  | 0 |
Less—unamortized discount and debt issuance costs | $ 1,461 |  | 0 |
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%
Principal amount of debt | $ 25,000 |  | 25,000 |
Less—unamortized discount and debt issuance costs | $ 347 |  | 432 |
Unsecured Debt | Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2015R-1 ("FAME Bonds 2015R-1") due August 2035 - fixed rate interest period through 2025; bearing interest at 5.125% |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 5.125% |  |  |
Principal amount of debt | $ 15,000 |  | 15,000 |
Less—unamortized discount and debt issuance costs | $ 482 |  | 552 |
Unsecured Debt | Finance Authority of Maine Solid Waste Disposal Revenue Bonds Series 2015R-2 ("FAME Bonds 2015R-2") due August 2035 - fixed rate interest period through 2025; bearing interest at 4.375% |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 4.375% |  |  | 4.375%
Principal amount of debt | $ 15,000 |  | 15,000 |
Less—unamortized discount and debt issuance costs | $ 343 |  | 417 |
Unsecured Debt | Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2013 ("Vermont Bonds") due April 2036 - fixed rate interest period through 2028; bearing interest at 4.625% |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 4.625% |  |  |
Principal amount of debt | $ 16,000 |  | 16,000 |
Less—unamortized discount and debt issuance costs | $ 487 |  | 541 |
Unsecured Debt | Business Finance Authority of the State of New Hampshire Solid Waste Disposal Revenue Bonds Series 2013 ("New Hampshire Bonds") due April 2029 - fixed rate interest period through 2029; bearing interest at 2.95% |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 2.95% |  |  |
Principal amount of debt | $ 11,000 |  | 11,000 |
Less—unamortized discount and debt issuance costs | $ 480 |  | 539 |
Notes payable maturing through June 2027; bearing interest at a weighted average of 3.5% |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted average interest rate | 3.50% |  |  |
Principal amount of debt | $ 4,933 |  | $ 5,464 |
LIBOR | Revolving Credit Facility due May 2023 ("Revolving Credit Facility"); bearing interest at LIBOR plus 1.75% |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 1.75% |  |  |
LIBOR | Secured Debt | Term Loan A Facility due May 2023 ("Term Loan Facility"); bearing interest at LIBOR plus 1.75% |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 1.75% |  |  |

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