Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation - Additional Information (Details)

v3.10.0.1
Stock-Based Compensation - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jun. 05, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in dollars per share)     $ 0.00    
Granted (in dollars per share)     $ 0 $ 3.35  
Options, outstanding, intrinsic value $ 52,300   $ 52,300    
Options, exercisable, intrinsic value $ 50,900   50,900    
Options, exercised, intrinsic value     $ 20    
Options, outstanding, weighted average remaining contractual term 6 years 1 month 13 days        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 5 years 9 months 26 days        
Performance stock units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Target Shares Granted (in shares)     178,975    
Incentive Award Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Tax benefit from compensation expense     $ 3,800 $ 8,700  
Compensation not yet recognized, stock options $ 13,200   13,200    
Compensation cost not yet recognized, period for recognition 2 years 2 months 9 days        
Incentive Award Plan | Stock options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation     500 2,800  
Incentive Award Plan | Non-vested restricted stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation     $ 2,000 $ 5,800  
Target Shares Granted (in shares)     319,250    
Restricted stock units, conversion of stock, conversion rights (in shares)         1
Compensation not yet recognized, stock options $ 6,600   $ 6,600    
Compensation cost not yet recognized, period for recognition     1 year 5 months 5 days    
Incentive Award Plan | Performance stock units          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation   $ 200 $ 1,300