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LONG-TERM DEBT - Components (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Principal |  |
Aggregate maturities of long-term debt | $ 491,774 | $ 603,780
Less current maturities | (55,558) | (73,199)
Total long-term debt | 436,216 | 530,581
Unamortized Discount and Debt Issuance Costs |  |
Unamortized debt issuance costs including current and non-current | (9,573) | (11,160)
Total unamortized debt issuance costs | (9,573) | (11,160)
Revolving credit facility |  |
Principal |  |
Aggregate maturities of long-term debt |  | 87,500
Unamortized Discount and Debt Issuance Costs |  |
Unamortized debt issuance costs including current and non-current | (6,067) | (7,196)
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 | (3,506) | (3,964)
Securitization Facility |  |
Principal |  |
Aggregate maturities of long-term debt | 38,100 | 55,900
May 2019 equipment financing |  |
Principal |  |
Aggregate maturities of long-term debt | 3,256 | 4,956
November 2019 equipment financing |  |
Principal |  |
Aggregate maturities of long-term debt | 37,231 | 42,367
June 2020 equipment financing |  |
Principal |  |
Aggregate maturities of long-term debt | 11,357 | $ 13,057
Line of credit |  |
Principal |  |
Aggregate maturities of long-term debt | $ 1,830 |

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