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LONG-TERM DEBT (Details) - USD ($) $ in Thousands | Feb. 15, 2018 | Oct. 10, 2017 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 07, 2017 | Feb. 16, 2017
--- | --- | --- | --- | --- | --- | ---
Current and long-term debt |  |  |  |  |  |
Principal amount outstanding, net |  |  | $ 612,353 | $ 409,168 |  |
Principal amount |  |  | 625,005 | 425,005 |  |
Unamortized debt issuance costs |  |  | 11,600 | 8,300 |  |
6.75% senior notes due 2025 |  |  |  |  |  |
Current and long-term debt |  |  |  |  |  |
Principal amount outstanding, net |  |  | $ 612,353 | $ 409,168 |  |
Interest rate (as a percent) |  |  | 6.75% | 6.75% | 6.75% | 6.75%
Principal amount |  |  |  |  | $ 850,000 | $ 850,000
Redemption price (as a percent) |  | 103.00% |  |  |  |
Unamortized discount |  |  | $ 7,700 | $ 8,100 |  |
Unamortized debt issuance costs |  |  | 10,700 | $ 7,700 |  |
Additional 2025 Notes |  |  |  |  |  |
Current and long-term debt |  |  |  |  |  |
Principal amount | $ 200,000 |  |  |  |  |
Redemption price (as a percent) | 103.00% |  |  |  |  |
Unamortized premium related to debt issued |  |  | $ 5,700 |  |  |

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