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LONG-TERM DEBT - Components (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Apr. 24, 2017
--- | --- | --- | ---
Principal |  |  |
Aggregate maturities of long-term debt | $ 789,280 | $ 667,000 |
Less current maturities | (13,157) | (92,000) |
Total long-term debt | 776,123 | 575,000 |
Unamortized Discount and Debt Issuance Costs |  |  |
Unamortized debt issuance costs including current and non-current | (7,929) | (10,996) |
Total unamortized debt issuance costs | (7,929) | (10,996) |
Revolving credit facility |  |  |
Principal |  |  |
Aggregate maturities of long-term debt | 255,000 | 175,000 |
Unamortized Discount and Debt Issuance Costs |  |  |
Unamortized debt issuance costs including current and non-current | (3,050) | (5,203) |
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 | (4,879) | (5,793) | $ (7,300)
Securitization Facility |  |  |
Principal |  |  |
Aggregate maturities of long-term debt | 73,800 | $ 92,000 |
Equipment Financing May 2019 |  |  |
Principal |  |  |
Aggregate maturities of long-term debt | 8,199 |  |
Equipment Financing November 2019 |  |  |
Principal |  |  |
Aggregate maturities of long-term debt | $ 52,281 |  |

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