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Equity-Based Compensation (Details) - LTIP - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Pool of shares of common stock for issuance in connection with share-based awards 8,500    
Number of shares available for grant 1,900    
Additional shares requested 1,400    
Award vesting period 3 years    
Vesting Period Change in Control Termination Without Cause 2 years    
Share-based compensation expense $ 11,730 $ 13,064 $ 6,935
Restricted Stock and Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Period of resignation or retirement of director from grant date 1 year    
Restricted stock and performance based share unit award activity      
Non-vested shares at the beginning of the period, number (in shares) 2,338    
Granted, number (in shares) 785    
Forfeited (111)    
Vested, number (in shares) (199)    
Non-vested shares at the end of the period, number (in shares) 2,813 2,338  
Weighted Average Grant-Date Fair Value (per share)      
Non-vested shares at the beginning of the period (in dollars per share) $ 4.02    
Granted (in dollars per share) 4.7 $ 1.97 $ 7.78
Forfeited 3.56    
Vested (in dollars per share) 10.87    
Non-vested shares at the end of the period (in dollars per share) $ 3.75 $ 4.02  
Unrecognized compensation cost $ 3,000    
Weighted-average period over which unrecognized compensation cost recognized prior to vesting 1 year 10 months 24 days    
Total fair value of awards vested $ 2,200 $ 2,400 $ 2,000
Performance Based Share Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Share-based compensation expense $ 4,900 $ 6,200  
Restricted stock and performance based share unit award activity      
Non-vested shares at the beginning of the period, number (in shares) 2,958    
Granted, number (in shares) 1,012    
Forfeited (125)    
Canceled, number (in shares) 78    
Vested, number (in shares) (82)    
Non-vested shares at the end of the period, number (in shares) 3,685 2,958  
Weighted Average Grant-Date Fair Value (per share)      
Non-vested shares at the beginning of the period (in dollars per share) $ 4.63    
Granted (in dollars per share) 5.85 $ 1.95 $ 9.66
Forfeited 3.87    
Canceled (in dollars per share) 25.63    
Vested (in dollars per share) 25.63    
Non-vested shares at the end of the period (in dollars per share) $ 4.08 $ 4.63  
Unrecognized compensation cost $ 10,800    
Weighted-average period over which unrecognized compensation cost recognized prior to vesting 1 year 7 months 6 days    
Total fair value of awards vested $ 2,100 $ 1,500 $ 1,700
Assumptions      
Risk-free interest rate 1.50%   1.00%
Expected volatility 76.30%   37.70%
Term 2 years 9 months 18 days   2 years 9 months 18 days
Fair value (per share) $ 5.85   $ 9.66
Performance Based Share Units | Maximum      
Performance-Based Share Units      
Percentage of target amount, high end of range 200.00%    
Performance Based Share Units | Minimum      
Performance-Based Share Units      
Percentage of target amount, low end of range 0.00%    
Non-Qualified Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period 10 years    
Non-qualified stock option activity      
Options outstanding at the beginning of the period (in shares) 1,098    
Expirations (in shares) 96    
Options outstanding at the end of the period (in shares) 1,002 1,098  
Exercisable at the end of the period (in shares) 1,002    
Weighted Average Exercise Price (per option)      
Options outstanding at the beginning of the period (in dollars per share) $ 16.73    
Expired (in dollars per share) 16.35    
Options outstanding at the end of the period (in dollars per share) 16.77 $ 16.73  
Exercisable at the end of the period (in dollars per share) $ 16.77