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DEBT - Components of Debt (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Sep. 02, 2020 | Dec. 31, 2019
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% | $ 45,724 | $ 31,486 |  |
Principal amount of debt | 562,570 | 548,419 |  |
Less—unamortized discount and debt issuance costs | 10,166 | 8,768 |  |
Debt less unamortized debt issuance costs | 552,404 | 539,651 |  |
Less—current maturities of debt | 9,901 | 9,240 |  |
Debt, less current portion | $ 542,503 | $ 530,411 |  |
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration] | Debt, less current portion | Debt, less current portion |  |
Line of Credit | Amended and Restated Revolving Credit Facility due December 2026 ("Revolving Credit Facility"); bearing interest at LIBOR plus 1.375% |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount of debt | $ 0 | $ 0 |  |
Line of Credit | Revolving Credit Facility due May 2023 amended and restated in December 2021; bore interest at LIBOR plus 1.75% |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 1.75% |  |  |
Principal amount of debt | $ 0 | 0 |  |
Secured Debt | Amended and Restated Term Loan A Facility due December 2026 ("Term Loan Facility"); bearing interest at LIBOR plus 1.375% |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount of debt | $ 350,000 | 0 |  |
Secured Debt | Term Loan A Facility due May 2023 amended and restated in December 2021; bore interest at LIBOR plus 1.75% |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 1.75% |  |  |
Principal amount of debt | $ 0 | 350,000 |  |
Credit Facility | Amended and Restated Revolving Credit Facility and Term Loan Facility (collectively, the "Credit Facility") |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Less—unamortized discount and debt issuance costs | 5,884 | 0 |  |
Credit Facility | Revolving Credit Facility and Term Loan A Facility amended and restated in December 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Less—unamortized discount and debt issuance costs | $ 0 | 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% |  |  | 2.875%
Principal amount of debt | $ 25,000 | 25,000 |  |
Less—unamortized discount and debt issuance costs | $ 933 | 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% |  |  | 3.125%
Principal amount of debt | $ 15,000 | 15,000 |  |
Less—unamortized discount and debt issuance costs | $ 268 | 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% |  | 2.75% |
Principal amount of debt | $ 40,000 | 40,000 |  |
Less—unamortized discount and debt issuance costs | $ 1,283 | 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 discount and debt issuance costs | $ 262 | 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 discount and debt issuance costs | $ 413 | 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 discount and debt issuance costs | $ 268 | 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 discount and debt issuance costs | $ 433 | 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 discount and debt issuance costs | $ 422 | 480 |  |
Notes payable maturing through June 2027; bearing interest at a weighted average of 3.1% |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted average interest rate | 3.10% |  |  |
Principal amount of debt | $ 4,846 | $ 4,933 |  |
LIBOR | Line of Credit | Amended and Restated Revolving Credit Facility due December 2026 ("Revolving Credit Facility"); bearing interest at LIBOR plus 1.375% |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 1.375% |  |  |
LIBOR | Secured Debt | Amended and Restated Term Loan A Facility due December 2026 ("Term Loan Facility"); bearing interest at LIBOR plus 1.375% |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate | 1.375% |  |  |

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