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Stock-Based Compensation - Additional Information (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
shares
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
day
$ / shares
shares
Sep. 30, 2015
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expenses | $     $ 18,761 $ 19,629
Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period     3 years  
Stock granted (in shares) | shares     3,393,900  
Granted, weighted average grant date fair value per unit (in usd per share) | $ / shares     $ 5.61  
Stock-based compensation expenses | $ $ 4,800 $ 5,000 $ 15,500 16,800
Restricted Stock [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Annual forfeiture rate (as a percent)     0.00%  
Restricted Stock [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Annual forfeiture rate (as a percent)     20.00%  
Performance Share Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock granted (in shares) | shares     910,000  
Granted, weighted average grant date fair value per unit (in usd per share) | $ / shares     $ 3.00  
Stock-based compensation expenses | $ $ 1,000 $ 1,000 $ 3,200 $ 2,900
Right to received shares of common stock (in shares) | shares 1   1  
Number of trading days | day     30  
Expected percentage earned (as a percent) 69.00%   69.00%  
Performance Share Units [Member] | Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Annual forfeiture rate (as a percent)     3.30%  
PSU granted percentage of earnings (as a percent)     0.00%  
Performance Share Units [Member] | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Annual forfeiture rate (as a percent)     4.60%  
PSU granted percentage of earnings (as a percent)     200.00%