XML 78 R50.htm IDEA: XBRL DOCUMENT v3.19.2
Stock-Based Compensation - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 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 $ 3,200 $ 2,700 $ 8,300 $ 6,600  
Accrued employee compensation and benefits 17,607   17,607   $ 27,479
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total compensation cost not yet recognized 21,800   $ 21,800    
Total compensation cost not yet recognized, period for recognition (in years)     1 year 7 months 6 days    
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total compensation cost not yet recognized 4,500   $ 4,500    
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 $ 500 200 $ 1,100 300  
LTIP          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period (in years) 3 years        
Share-based compensation expense $ 800 $ 200 1,200 $ 600  
Accrued employee compensation and benefits $ 2,500   $ 2,500   $ 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%