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LONG-TERM DEBT - Components (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Principal |  |
Aggregate maturities of long-term debt | $ 671,762 | $ 789,280
Less current maturities | (89,271) | (13,157)
Total long-term debt | 582,491 | 776,123
Unamortized Discount and Debt Issuance Costs |  |
Unamortized debt issuance costs including current and non-current | (11,472) | (7,929)
Total unamortized debt issuance costs | (11,472) | (7,929)
Revolving credit facility |  |
Principal |  |
Aggregate maturities of long-term debt | 135,000 | 255,000
Unamortized Discount and Debt Issuance Costs |  |
Unamortized debt issuance costs including current and non-current | (7,280) | (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 | (4,192) | (4,879)
Securitization Facility |  |
Principal |  |
Aggregate maturities of long-term debt | 72,200 | 73,800
May 2019 equipment financing |  |
Principal |  |
Aggregate maturities of long-term debt | 5,785 | 8,199
November 2019 equipment financing |  |
Principal |  |
Aggregate maturities of long-term debt | 44,890 | $ 52,281
June 2020 equipment financing |  |
Principal |  |
Aggregate maturities of long-term debt | $ 13,887 |

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