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Stock-Based Compensation - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense $ 2,800 $ 1,100 $ 6,800 $ 3,800  
Accrued employee compensation and benefits 14,136   14,136   $ 25,085
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total compensation cost not yet recognized 16,600   $ 16,600    
Total compensation cost not yet recognized, period for recognition (in years)     1 year 7 months 22 days    
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total compensation cost not yet recognized 5,400   $ 5,400    
Total compensation cost not yet recognized, period for recognition (in years)     1 year 7 months 26 days    
LTIP          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period (in years)     3 years    
Share-based compensation expense 300 $ (1,100) $ 1,100 $ (800)  
Accrued employee compensation and benefits $ 2,800   $ 2,800   $ 1,600
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%