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LONG-TERM DEBT (Details) - USD ($) $ in Thousands | Feb. 15, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Oct. 10, 2017 | Oct. 07, 2017 | Sep. 07, 2017 | Jul. 10, 2017 | Feb. 16, 2017 | Sep. 09, 2016 | Jun. 09, 2016 | Dec. 21, 2015 | May 01, 2015
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Current and long-term debt |  |  |  |  |  |  |  |  |  |  |  |
Principal amount outstanding, net |  | $ 613,105 | $ 409,168 |  |  |  |  |  | $ 1,016,160 |  |  |
Predecessor |  |  |  |  |  |  |  |  |  |  |  |
Current and long-term debt |  |  |  |  |  |  |  |  |  |  |  |
Principal amount outstanding, net |  |  |  |  |  |  |  |  | $ 1,031,114 |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  | 13.00% |  |
8.625% senior secured second lien notes due 2020 |  |  |  |  |  |  |  |  |  |  |  |
Current and long-term debt |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  | 8.625% |  |  |  |
8.625% senior secured second lien notes due 2020 | Predecessor |  |  |  |  |  |  |  |  |  |  |  |
Current and long-term debt |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  | 8.625%
Principal amount |  |  |  |  |  |  |  |  |  |  |  | $ 700,000
12.0% senior secured second lien notes due 2022 |  |  |  |  |  |  |  |  |  |  |  |
Current and long-term debt |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 12.00% |  |  |  |  |  |  |
12.0% senior secured second lien notes due 2022 | Predecessor |  |  |  |  |  |  |  |  |  |  |  |
Current and long-term debt |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  | 12.00% |
Principal amount |  |  |  |  |  |  |  |  |  |  | $ 112,800 |
6.75% senior notes due 2025 |  |  |  |  |  |  |  |  |  |  |  |
Current and long-term debt |  |  |  |  |  |  |  |  |  |  |  |
Principal amount outstanding, net |  | $ 613,105 | $ 409,168 |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 6.75% | 6.75% |  |  |  | 6.75% | 6.75% |  |  |  |
Unamortized discount |  | $ 7,200 | $ 8,100 |  |  |  |  |  |  |  |  |
Principal amount |  | 625,005 | 425,005 |  |  | $ 850,000 | $ 850,000 | $ 850,000 |  |  |  |
Principal amount repurchased |  |  |  | $ 425,000 |  |  |  |  |  |  |  |
Additional 2025 Notes |  |  |  |  |  |  |  |  |  |  |  |
Current and long-term debt |  |  |  |  |  |  |  |  |  |  |  |
Principal amount | $ 200,000 |  |  |  |  |  |  |  |  |  |  |
Unamortized debt issuance costs |  | 10,100 | 7,700 |  |  |  |  |  |  |  |  |
Issue price as a percentage of par value | 103.00% |  |  |  |  |  |  |  |  |  |  |
Unamortized premium related to debt issued |  | 5,400 |  |  |  |  |  |  |  |  |  |
Senior revolving credit facility |  |  |  |  |  |  |  |  |  |  |  |
Current and long-term debt |  |  |  |  |  |  |  |  |  |  |  |
Unamortized debt issuance costs |  | $ 11,100 | $ 8,300 |  |  |  |  |  |  |  |  |

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