Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Additional Information (Details)

v3.19.1
Stock-Based Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Jun. 05, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in dollars per share) $ 0.00    
Options, outstanding, intrinsic value $ 77,500    
Options, exercisable, intrinsic value 74,300    
Options, exercised, intrinsic value $ 1,390    
Term for outstanding stock 5 years 7 months 17 days    
Term for exercisable stock 5 years 5 months 16 days    
Performance stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Target Shares Granted (in shares) 199,413    
Incentive Award Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Tax benefit from compensation expense $ 1,800 $ 800  
Compensation not yet recognized, stock options $ 23,100    
Compensation cost not yet recognized, period for recognition 2 years 4 months 21 days    
Incentive Award Plan | Stock options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation $ 200 200  
Incentive Award Plan | Non-vested restricted stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation $ 900 400  
Target Shares Granted (in shares) 318,332    
Restricted stock units, conversion of stock, conversion rights (in shares)     1
Compensation not yet recognized, stock options $ 11,300    
Compensation cost not yet recognized, period for recognition 2 years 5 months 19 days    
Incentive Award Plan | Performance stock units      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation $ 700 $ 200