Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.2
Employee Benefits and Compensation Plans - Summary of Share Option Awards (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Weighted- Average Contractual Term (years)    
Options Outstanding, Weighted- Average Contractual Term 5 years 9 months 25 days 6 years 2 months 19 days
Aggregate intrinsic Value    
Options Outstanding, Aggregate Intrinsic Value $ 27,599,000 $ 13,946,000
Time-Based Options    
Number of Share Option Awards    
Outstanding as of January 1, 2019 5,686,793  
Exercised (197,076)  
Forfeited and cancelled (35,333)  
Outstanding as of June 30, 2019 5,454,384 5,686,793
Weighted-Average Exercise Price    
Outstanding as of January 1, 2019 $ 50.65  
Exercised 39.19  
Forfeited and cancelled 56.83  
Outstanding as of June 30, 2019 $ 51.02 $ 50.65
Performance-Based Awards    
Number of Share Option Awards    
Outstanding as of January 1, 2019 410,499  
Exercised (99,924)  
Forfeited and cancelled (156,251)  
Outstanding as of June 30, 2019 154,324 410,499
Weighted-Average Exercise Price    
Outstanding as of January 1, 2019 $ 45.67  
Exercised 19.00  
Forfeited and cancelled 59.43  
Outstanding as of June 30, 2019 $ 49.02 $ 45.67
Market-Based Awards    
Number of Share Option Awards    
Outstanding as of January 1, 2019 208,333  
Exercised 0  
Forfeited and cancelled 0  
Outstanding as of June 30, 2019 208,333 208,333
Weighted-Average Exercise Price    
Outstanding as of January 1, 2019 $ 59.43  
Exercised 0  
Forfeited and cancelled 0  
Outstanding as of June 30, 2019 $ 59.43 $ 59.43