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LONG-TERM DEBT - Components (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Principal |  |
Aggregate maturities of long-term debt | $ 603,780 | $ 789,280
Less current maturities | (73,199) | (13,157)
Total long-term debt | 530,581 | 776,123
Unamortized Discount and Debt Issuance Costs |  |
Unamortized debt issuance costs including current and non-current | (11,160) | (7,929)
Total unamortized debt issuance costs | (11,160) | (7,929)
Revolving credit facility |  |
Principal |  |
Aggregate maturities of long-term debt | 87,500 | 255,000
Unamortized Discount and Debt Issuance Costs |  |
Unamortized debt issuance costs including current and non-current | (7,196) | (3,050)
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 | (3,964) | (4,879)
Securitization Facility |  |
Principal |  |
Aggregate maturities of long-term debt | 55,900 | 73,800
May 2019 equipment financing |  |
Principal |  |
Aggregate maturities of long-term debt | 4,956 | 8,199
November 2019 equipment financing |  |
Principal |  |
Aggregate maturities of long-term debt | 42,367 | $ 52,281
June 2020 equipment financing |  |
Principal |  |
Aggregate maturities of long-term debt | $ 13,057 |

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