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DEBT - Summary of Debt (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2022 | Dec. 31, 2021
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% | $ 45,889 | $ 45,724
Principal amount of debt | 593,662 | 562,570
Less - unamortized debt issuance costs | 10,470 | 10,166
Debt less unamortized debt issuance costs | 583,192 | 552,404
Less—current maturities of debt | 7,636 | 9,901
Debt, less current portion | 575,556 | 542,503
Secured Debt | Term loan A facility ("Term Loan Facility") due December 2026; bearing interest at LIBOR plus 1.375% |  |
Debt Instrument [Line Items] |  |
Principal amount of debt | $ 350,000 | 350,000
Secured Debt | Term loan A facility ("Term Loan Facility") due December 2026; bearing interest at LIBOR plus 1.375% | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 1.375% |
Line of Credit | 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 December 2026 ("Revolving Credit Facility"); bearing interest at LIBOR plus 1.375% | LIBOR |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 1.375% |
Credit Facility | Revolving Credit Facility and Term Loan Facility (collectively, the "Credit Facility") |  |
Debt Instrument [Line Items] |  |
Less - unamortized debt issuance costs | $ 5,306 | 5,884
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 | $ 899 | 933
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 | $ 238 | 268
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 | $ 1,194 | 1,283
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 | $ 219 | 262
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 | $ 378 | 413
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 | $ 231 | 268
Unsecured Debt | Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2013 ("Vermont Bonds 2013") 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 | $ 405 | 433
Unsecured Debt | Vermont Economic Development Authority Solid Waste Disposal Long-Term Revenue Bonds Series 2022A-1 ("Vermont Bonds 2022A-1") due June 2052 - fixed rate interest period through 2027; bearing interest at 5.00% |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 5.00% |
Principal amount of debt | $ 35,000 | 0
Less - unamortized debt issuance costs | $ 1,207 | 0
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 | $ 393 | 422
Notes payable maturing through August 2024; bearing interest at a weighted average of 1.6% |  |
Debt Instrument [Line Items] |  |
Weighted average interest rate | 1.60% |
Principal amount of debt | $ 773 | $ 4,846

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