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Stock-Based Compensation - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense $ 2,100 $ 2,600 $ 5,900 $ 8,700  
Accrued employee compensation and benefits 20,767   20,767   $ 25,722
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total compensation cost not yet recognized 4,100   $ 4,100    
Total compensation cost not yet recognized, period for recognition (in years)     1 year 6 months 4 days    
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total compensation cost not yet recognized 14,300   $ 14,300    
Total compensation cost not yet recognized, period for recognition (in years)     1 year 8 months 18 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 $ 700 $ (500) $ 1,200  
Accrued employee compensation and benefits $ 1,500   $ 1,500   $ 4,000
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%