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Stock-Based Compensation - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Grants in period (in shares)     132,832    
Share-based compensation expense $ 2,600 $ 3,800 $ 10,900 $ 10,400  
Accrued employee compensation and benefits 21,410   21,410   $ 27,479
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total compensation cost not yet recognized 18,300   $ 18,300    
Total compensation cost not yet recognized, period for recognition (in years)     1 year 6 months    
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total compensation cost not yet recognized 3,800   $ 3,800    
Total compensation cost not yet recognized, period for recognition (in years)     1 year 6 months    
Cash-settled Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense $ (200) 300 $ 1,000 700  
LTIP          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period (in years) 3 years        
Share-based compensation expense $ 500 $ 1,100 1,700 $ 1,600  
Accrued employee compensation and benefits $ 2,900   $ 2,900   $ 2,400
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%