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DEBT (Details) - USD ($) $ in Thousands | Sep. 07, 2017 | Sep. 30, 2019 | Aug. 02, 2019 | Dec. 31, 2018 | Feb. 16, 2017
--- | --- | --- | --- | --- | ---
Current and long-term debt |  |  |  |  |
Long-term debt, current |  | $ 258,234 |  |  |
Long-term debt, non-current |  |  |  | $ 613,105 |
Debt |  | 258,234 |  | 613,105 |
Unamortized debt issuance costs |  | $ 0 |  | 11,100 |
8.625% senior secured second lien notes due 2020 |  |  |  |  |
Current and long-term debt |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 8.625%
6.75% senior notes due 2025 |  |  |  |  |
Current and long-term debt |  |  |  |  |
Long-term debt, non-current |  |  |  | $ 613,105 |
Interest rate (as a percent) |  | 6.75% | 6.75% | 6.75% | 6.75%
Unamortized discount |  |  |  | $ 7,200 |
Additional 2025 Notes |  |  |  |  |
Current and long-term debt |  |  |  |  |
Unamortized debt issuance costs |  |  |  | 10,100 |
Unamortized premium related to debt issued |  |  |  | $ 5,400 |
DIP Credit Agreement |  |  |  |  |
Current and long-term debt |  |  |  |  |
Long-term debt, current |  | $ 35,000 |  |  |
Senior revolving credit facility |  |  |  |  |
Current and long-term debt |  |  |  |  |
Long-term debt, current |  | $ 223,234 |  |  |
Interest added to applicable interest rate in effect (as a percent) | 2.00% |  |  |  |

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