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Stock-Based Compensation - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Grants in period (in shares)     95,891    
Share-based compensation expense $ 3,000 $ 2,700 $ 7,600 $ 6,200  
Accrued employee compensation and benefits 22,785   22,785   $ 21,237
Stock-Settled Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total compensation cost not yet recognized 20,900   $ 20,900    
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 3,900   $ 3,900    
Total compensation cost not yet recognized, period for recognition (in years)     1 year 9 months 18 days    
Cash-Settled Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense 100 400 $ 1,500 (900)  
Accrued employee compensation and benefits 800   800   2,500
LTIP          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based compensation expense 300 $ (300) 500 $ 400  
Accrued employee compensation and benefits $ 1,200   $ 1,200   $ 2,100
Award vesting period (in years)     3 years    
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%