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CONVERTIBLE SENIOR NOTES (Details) $ / shares in Units, $ in Thousands |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 27, 2010 USD ($) item $ / shares | Dec. 31, 2014 USD ($) | Jul. 09, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($)
Convertible senior notes |  |  |  |  |
Non-cash deferred financing amortization costs included in interest expense |  | $ 845 |  |  |
Predecessor |  |  |  |  |
Convertible senior notes |  |  |  |  |
Offering price of common stock (in dollars per share) | $ / shares | $ 16.00 |  |  |  |
Net carrying amount of the liability component |  |  |  | $ 115,881 |
Non-cash interest expense recognized |  |  | $ 1,592 | 4,963 | $ 4,537
Non-cash deferred financing amortization costs included in interest expense |  |  | $ 4,461 | 9,116 | $ 5,413
Predecessor | 2010 Notes |  |  |  |  |
Convertible senior notes |  |  |  |  |
2010 Notes issued | $ 125,000 |  |  |  |
Conversion rate of common stock per $1000 of principal amount of convertible notes (in shares) | 51.0204 |  |  |  |
Principal amount used for debt instrument conversion ratio | $ 1,000 |  |  |  |
Initial conversion price of convertible notes into common stock (in dollars per share) | $ / shares | $ 19.60 |  |  |  |
Premium on sale price to calculate exchange price of notes (as a percent) | 22.50% |  |  |  |
Number of shares to be converted into common stock (in shares) | item | 6,377,551 |  |  |  |
Interest rate assumed for estimating fair value of the liability component (as a percent) | 10.00% |  |  |  |
Estimated fair value of liability component | $ 100,625 |  |  |  |
Estimated fair value of conversion option | 24,375 |  |  | 24,375 |
Issuance costs allocated to equity component | 918 |  |  |  |
Issuance costs allocated to liability component | $ 3,637 |  |  |  |
Amortization period of debt issuance costs | 5 years |  |  |  |
Percentage of principal amount at which the note may be repurchased prior to the maturity date of note | 100.00% |  |  |  |
Carrying amount of the equity component (additional paid-in capital) | $ 24,375 |  |  | 24,375 |
Principal amount of the 2010 Notes |  |  |  | 125,000 |
Unamortized discount of the liability component |  |  |  | 9,119 |
Net carrying amount of the liability component |  |  |  | $ 115,881 |
Effective interest rate on liability component (as a percent) |  |  | 10.00% | 10.00% | 10.00%
Cash interest expense recognized |  |  | $ 1,886 | $ 6,250 | $ 6,263
Non-cash interest expense recognized |  |  | 1,592 | 4,963 | 4,537
Non-cash deferred financing amortization costs included in interest expense |  |  | 216 | $ 720 | $ 722
Interest expense |  |  | $ 2,522 |  |

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