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Stock-Based Compensation - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 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 $ 5,100 $ 3,900  
Accrued employee compensation and benefits 15,338   $ 27,479
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total compensation cost not yet recognized $ 24,100    
Total compensation cost not yet recognized, period for recognition (in years) 1 year 8 months 29 days    
Restricted stock, granted (in shares) 13,464    
Vested in period (in shares) 12,293    
Restricted stock, forfeited (in shares) 0    
Cash-settled restricted stock units, outstanding (in shares) 375,700   374,529
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total compensation cost not yet recognized $ 5,800    
Total compensation cost not yet recognized, period for recognition (in years) 1 year 9 months 11 days    
Cash-settled Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock, granted (in shares) 19,736    
Restricted stock, forfeited (in shares) 3,622    
Cash-settled restricted stock units, outstanding (in shares) 69,563   53,766
Share-based compensation expense $ 600 100  
LTIP      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period (in years) 3 years    
Share-based compensation expense $ 400 $ 400  
Accrued employee compensation and benefits $ 1,700   $ 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%