Annual report pursuant to Section 13 and 15(d)

Employee Benefits and Share-Based Compensation - Summary of Share Option Awards (Details 1)

v3.8.0.1
Employee Benefits and Share-Based Compensation - Summary of Share Option Awards (Details 1) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Weighted- Average Contractual Term (years)    
Outstanding 6 years 11 months 27 days 7 years 9 months 22 days
Vested and expected to vest 6 years 11 months 23 days  
Exercisable 6 years 8 months 9 days  
Aggregate intrinsic Value    
Outstanding $ 50,021 $ 35,429
Vested and expected to vest 50,021  
Exercisable $ 39,115  
Time Based Options    
Number of Share Option Awards    
Outstanding as of beginning of period 7,775,058  
Granted 0  
Exercised (738,672)  
Forfeited and cancelled (455,488)  
Outstanding as of end of period 6,580,898 7,775,058
Vested and expected to vest as of end of period 6,580,898  
Exercisable as of end of period 4,061,424  
Weighted-Average Exercise Price    
Outstanding as of beginning of period $ 48.04  
Granted 0  
Exercised 34.02  
Forfeited and cancelled 54.27  
Outstanding as of end of period 49.18 $ 48.04
Vested and expected to vest as of end of period 49.18  
Exercisable as of end of period $ 47.98  
Performance Based Options    
Number of Share Option Awards    
Outstanding as of beginning of period 432,978  
Granted 156,249  
Exercised (121,509)  
Forfeited and cancelled (93,749)  
Outstanding as of end of period 373,969 432,978
Vested and expected to vest as of end of period 373,969  
Exercisable as of end of period 373,969  
Weighted-Average Exercise Price    
Outstanding as of beginning of period $ 23.86  
Granted 59.43  
Exercised 19  
Forfeited and cancelled 59.43  
Outstanding as of end of period 31.39 $ 23.86
Vested and expected to vest as of end of period 31.39  
Exercisable as of end of period $ 31.39  
Market Based Share Option Awards    
Number of Share Option Awards    
Outstanding as of beginning of period 208,333  
Granted 0  
Exercised 0  
Forfeited and cancelled 0  
Outstanding as of end of period 208,333 208,333
Vested and expected to vest as of end of period 0  
Exercisable as of end of period 0  
Weighted-Average Exercise Price    
Outstanding as of beginning of period $ 59.43  
Granted 0  
Exercised 0  
Forfeited and cancelled 0  
Outstanding as of end of period 59.43 $ 59.43
Vested and expected to vest as of end of period 59.43  
Exercisable as of end of period $ 0