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Stock-Based Compensation - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense $ 200 $ 2,800 $ 6,600 $ 6,800  
Accrued employee compensation and benefits 9,930   9,930   $ 14,609
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total compensation cost not yet recognized 14,200   $ 14,200    
Total compensation cost not yet recognized, period for recognition (in years)     1 year 8 months 15 days    
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total compensation cost not yet recognized 3,100   $ 3,100    
Total compensation cost not yet recognized, period for recognition (in years)     1 year 8 months 20 days    
LTIP          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period (in years)     3 years    
Share-based compensation expense (1,300) $ 300 $ (1,100) $ 1,100  
Accrued employee compensation and benefits $ 100   $ 100   $ 1,200
LTIP | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Multiplier for target award based on total shareholder return on common stock (percent)     0.00%    
LTIP | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Multiplier for target award based on total shareholder return on common stock (percent)     200.00%