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LONG-TERM DEBT - Components (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Principal |  |
Aggregate maturities of long-term debt | $ 434,386 | $ 443,080
Less current maturities | (14,942) | (16,071)
Total long-term debt | 419,444 | 427,009
Unamortized Discount and Debt Issuance Costs |  |
Unamortized debt issuance costs including current and non-current | (6,453) | (8,067)
Total unamortized debt issuance costs | (6,453) | (8,067)
Revolving credit facility |  |
Unamortized Discount and Debt Issuance Costs |  |
Unamortized debt issuance costs including current and non-current | (3,861) | (5,019)
Senior notes due 2025 |  |
Principal |  |
Aggregate maturities of long-term debt | 400,000 | 400,000
Unamortized Discount and Debt Issuance Costs |  |
Unamortized debt issuance costs including current and non-current | (2,592) | (3,048)
May 2019 equipment financing |  |
Principal |  |
Aggregate maturities of long-term debt |  | 1,503
November 2019 equipment financing |  |
Principal |  |
Aggregate maturities of long-term debt | 26,587 | 31,972
June 2020 equipment financing |  |
Principal |  |
Aggregate maturities of long-term debt | $ 7,799 | $ 9,605

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