Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Narratives (Details)

v3.19.2
Stock-Based Compensation - Narratives (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award        
Share-based compensation expense $ 5,370 $ 3,796 $ 8,770 $ 7,627
Share-based compensation expense, tax benefit $ 1,326 $ 938 $ 2,166 $ 1,885
Number of shares available for grant (shares) 3,702,921   3,702,921  
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award        
Granted     1,245,628  
Unrecognized share-based compensation expense $ 26,452   $ 26,452  
Unrecognized share-based compensation expense, period for recognition     1 year 11 months 12 days  
Restricted Stock Units (RSUs) | Director        
Share-based Compensation Arrangement by Share-based Payment Award        
Award vesting period     1 year  
Restricted Stock Units (RSUs) | Employee        
Share-based Compensation Arrangement by Share-based Payment Award        
Award vesting period     3 years  
Performance Stock Units (PSUs)        
Share-based Compensation Arrangement by Share-based Payment Award        
Granted     550,676  
Award vesting period     3 years  
Unrecognized share-based compensation expense $ 7,626   $ 7,626  
Unrecognized share-based compensation expense, period for recognition     2 years 8 months 1 day  
Performance Stock Units (PSUs) | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award        
Award vesting percentage     0.00%  
Performance Stock Units (PSUs) | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award        
Award vesting percentage     200.00%