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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