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Stock-Based Compensation (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants in period (in shares) 167,969    
Share-based compensation expense $ 3,500 $ 5,100  
Accrued employee compensation and benefits 11,714   $ 23,904
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total compensation cost not yet recognized $ 19,400    
Total compensation cost not yet recognized, period for recognition (in years) 1 year 4 months 24 days    
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total compensation cost not yet recognized $ 4,700    
Total compensation cost not yet recognized, period for recognition (in years) 1 year 7 months 6 days    
Cash-settled Restricted Stock Units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based compensation expense $ (1,300) 600  
LTIP      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period (in years) 3 years    
Share-based compensation expense $ 800 $ 400  
Accrued employee compensation and benefits $ 2,100   $ 2,900
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%