Quarterly report pursuant to Section 13 or 15(d)

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

v3.8.0.1
Employee Benefits and Compensation Plans - Summary of Share Option Awards (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Additional General Disclosures [Abstract]    
Options Outstanding, Weighted- Average Contractual Term 7 years 2 months 19 days 7 years 9 months 22 days
Options Outstanding, Aggregate Intrinsic Value $ 54,689 $ 35,429
Time Based Options    
Number of Share Option Awards    
Outstanding as of January 1, 2017 7,775,058  
Granted 0  
Exercised (704,339)  
Forfeited and cancelled (385,070)  
Outstanding as of September 30, 2017 6,685,649 7,775,058
Weighted-Average Exercise Price    
Outstanding as of January 1, 2017 $ 48.04  
Granted 0.00  
Exercised 33.92  
Forfeited and cancelled 54.42  
Outstanding as of September 30, 2017 $ 49.16 $ 48.04
Performance Based Options    
Number of Share Option Awards    
Outstanding as of January 1, 2017 432,978  
Granted 156,249  
Exercised (83,288)  
Forfeited and cancelled (93,749)  
Outstanding as of September 30, 2017 412,190 432,978
Weighted-Average Exercise Price    
Outstanding as of January 1, 2017 $ 23.86  
Granted 59.43  
Exercised 19.00  
Forfeited and cancelled 59.43  
Outstanding as of September 30, 2017 $ 30.24 $ 23.86
Market-Based Awards    
Number of Share Option Awards    
Outstanding as of January 1, 2017 208,333  
Outstanding as of September 30, 2017 208,333 208,333
Weighted-Average Exercise Price    
Outstanding as of January 1, 2017 $ 59.43  
Granted 0.00  
Exercised 0.00  
Forfeited and cancelled 0.00  
Outstanding as of September 30, 2017 $ 59.43 $ 59.43