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LONG-TERM DEBT - Components (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Principal |  |
Aggregate maturities of long-term debt | $ 815,653 | $ 789,280
Less current maturities | (71,727) | (13,157)
Total long-term debt | 743,926 | 776,123
Unamortized Discount and Debt Issuance Costs |  |
Unamortized debt issuance costs including current and non-current | (12,922) | (7,929)
Total unamortized debt issuance costs | (12,922) | (7,929)
Revolving credit facility |  |
Principal |  |
Aggregate maturities of long-term debt | 300,000 | 255,000
Unamortized Discount and Debt Issuance Costs |  |
Unamortized debt issuance costs including current and non-current | (8,273) | (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 | (4,649) | (4,879)
Securitization Facility |  |
Principal |  |
Aggregate maturities of long-term debt | 58,400 | 73,800
Equipment Financing May 2019 |  |
Principal |  |
Aggregate maturities of long-term debt | 7,407 | 8,199
Equipment Financing November 2019 |  |
Principal |  |
Aggregate maturities of long-term debt | $ 49,846 | $ 52,281

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