Quarterly report pursuant to Section 13 or 15(d)

Employee Benefits and Compensation Plans - Summary of Share Option Awards (Details)

v3.10.0.1
Employee Benefits and Compensation Plans - Summary of Share Option Awards (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]    
Options Outstanding, Weighted- Average Contractual Term 6 years 5 months 16 days 6 years 11 months 27 days
Options Outstanding, Aggregate Intrinsic Value $ 47,269 $ 50,021
Time Based Options    
Number of Share Option Awards    
Outstanding as of January 1, 2018 6,580,898  
Granted 0  
Exercised (625,611)  
Forfeited and cancelled (192,333)  
Outstanding as of September 30, 2018 5,762,954  
Weighted-Average Exercise Price    
Outstanding as of January 1, 2018 $ 49.18  
Granted 0  
Exercised 34.44  
Forfeited and cancelled 54.7  
Outstanding as of September 30, 2018 $ 50.6  
Performance-Based Awards    
Number of Share Option Awards    
Outstanding as of January 1, 2018 373,969  
Granted 208,335  
Exercised (109,285)  
Forfeited and cancelled (52,084)  
Outstanding as of September 30, 2018 420,935  
Weighted-Average Exercise Price    
Outstanding as of January 1, 2018 $ 31.39  
Granted 59.43  
Exercised 19  
Forfeited and cancelled 59.43  
Outstanding as of September 30, 2018 $ 45.01  
Market-Based Awards    
Number of Share Option Awards    
Outstanding as of January 1, 2018 208,333  
Granted 0  
Exercised 0  
Forfeited and cancelled 0  
Outstanding as of September 30, 2018 208,333  
Weighted-Average Exercise Price    
Outstanding as of January 1, 2018 $ 59.43  
Granted 0  
Exercised 0  
Forfeited and cancelled 0  
Outstanding as of September 30, 2018 $ 59.43