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STOCK-BASED COMPENSATION Activity (Details) - Restricted Stock - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Weighted-Average Grant Date Fair Value per Share    
Unvested restricted stock at the beginning of the period (in dollars per share) $ 9.06 $ 20.94
Unvested restricted stock at the end of the period (in dollars per share) $ 2.78 $ 9.06
Service vesting    
Number of Shares    
Unvested restricted units at the beginning of the period (in shares) 610,756  
Granted (in shares) 105,000  
Vesting (in shares) (358,079)  
Converted to service-based (56,999)  
Forfeited (in shares) (95,954)  
Unvested restricted units at the end of the period (in shares) 318,722 610,756
Weighted-Average Grant Date Fair Value per Share    
Unvested restricted stock at the beginning of the period (in dollars per share) $ 9.33  
Granted (in dollars per share) 1.68  
Vested (in dollars per share) 7.79  
Converted to service-based (in dollars per share) 4.18  
Forfeited (in dollars per share) 8.59  
Unvested restricted stock at the end of the period (in dollars per share) $ 6.48 $ 9.33
Service vesting | Maximum    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]    
Vesting period 4 years  
Service vesting | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]    
Vesting period 2 years  
Modified service vesting    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]    
Cumulative effect of compensation expense reversal $ 0.3  
Vesting period 3 years  
Performance vesting    
Number of Shares    
Unvested restricted units at the beginning of the period (in shares) 98,605  
Granted (in shares) 0  
Converted to service-based (28,513)  
Forfeited (in shares) (49,598)  
Unvested restricted units at the end of the period (in shares) 20,494 98,605
Weighted-Average Grant Date Fair Value per Share    
Unvested restricted stock at the beginning of the period (in dollars per share) $ 17.75  
Converted to service-based (in dollars per share) 4.18  
Forfeited (in dollars per share) 18.86  
Unvested restricted stock at the end of the period (in dollars per share) $ 19.82 $ 17.75
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]    
Vesting period   3 years
Market-based vesting    
Number of Shares    
Unvested restricted units at the beginning of the period (in shares) 90,824  
Granted (in shares) 926,200 0
Converted to service-based (28,486)  
Forfeited (in shares) (65,779)  
Unvested restricted units at the end of the period (in shares) 922,759 90,824
Weighted-Average Grant Date Fair Value per Share    
Unvested restricted stock at the beginning of the period (in dollars per share) $ 20.43  
Granted (in dollars per share) 2.91  
Converted to service-based (in dollars per share) 4.18  
Forfeited (in dollars per share) 15.92  
Unvested restricted stock at the end of the period (in dollars per share) $ 3.34 $ 20.43
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]    
Expected volatility 39.50%  
Expected dividend yield 0.00%  
Risk-free interest rate 1.13%  
Vesting period 5 years  
Market-based vesting | Minimum    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]    
Expected term (years) 1 year 6 months