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DEBT - Summary of Debt (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |
Weighted-average discount rate - finance leases | 3.60% |
Finance leases maturing through December 2107; bearing interest at a weighted average of 3.6% | $ 44,804 | $ 31,486
Principal amount of debt | 558,556 | 548,419
Less - unamortized debt issuance costs | 7,053 | 8,768
Debt less unamortized debt issuance costs | 551,503 | 539,651
Less—current maturities of debt | 16,751 | 9,240
Debt, less current portion | 534,752 | 530,411
Revolving line of credit facility ("Revolving Credit Facility") due May 2023; bearing interest at LIBOR plus 1.50% |  |
Debt Instrument [Line Items] |  |
Principal amount of debt | $ 0 | 0
Revolving line of credit facility ("Revolving Credit Facility") due May 2023; bearing interest at LIBOR plus 1.50% | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.50% |
Secured Debt | Term loan A facility ("Term Loan Facility") due May 2023; bearing interest at LIBOR plus 1.50% |  |
Debt Instrument [Line Items] |  |
Principal amount of debt | $ 347,375 | 350,000
Secured Debt | Term loan A facility ("Term Loan Facility") due May 2023; bearing interest at LIBOR plus 1.50% | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate | 1.50% |
Credit Facility |  |
Debt Instrument [Line Items] |  |
Less - unamortized debt issuance costs | $ 2,609 | 3,839
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% |
Principal amount of debt | $ 25,000 | 25,000
Less - unamortized debt issuance costs | $ 950 | 1,000
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% |
Principal amount of debt | $ 15,000 | 15,000
Less - unamortized debt issuance costs | $ 283 | 329
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% |
Principal amount of debt | $ 40,000 | 40,000
Less - unamortized debt issuance costs | $ 1,328 | 1,461
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% |
Principal amount of debt | $ 25,000 | 25,000
Less - unamortized debt issuance costs | $ 283 | 347
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 debt issuance costs | $ 430 | 482
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% |
Principal amount of debt | $ 15,000 | 15,000
Less - unamortized debt issuance costs | $ 287 | 343
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 debt issuance costs | $ 446 | 487
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 debt issuance costs | $ 437 | 480
Notes payable maturing through June 2027; bearing interest at a weighted average of 3.4% |  |
Debt Instrument [Line Items] |  |
Weighted average interest rate | 3.40% |
Principal amount of debt | $ 4,377 | $ 4,933

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