Quarterly report pursuant to Section 13 or 15(d)

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

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Employee Benefits and Share Option Plans - Summary of Share Option Awards (Details ) - USD ($)
$ / shares in Units, $ in Thousands
 6 Months Ended
Jun. 30, 2015
Weighted- Average Contractual Term (years)  
Outstanding as of January 1, 2015 and June 30, 2015 7 years 7 months 10 days
Aggregate intrinsic Value  
Outstanding as of January 1, 2015 $ 142,831
Outstanding as of June 30, 2015 $ 112,508
Time Based Options  
Number of Share Option Awards  
Outstanding as of January 1, 2015 6,079,881
Number of shares granted 250,000
Exercised (1,799,944)
Forfeited and cancelled (819,137)
Outstanding as of June 30, 2015 3,710,800
Weighted-Average Exercise Price  
Outstanding as of January 1, 2015 $ 29.92
Granted 47.67
Exercised 26.97
Forfeited and cancelled 31.99
Outstanding as of June 30, 2015 $ 32.09
Performance Based Options  
Number of Share Option Awards  
Outstanding as of January 1, 2015 1,457,314
Number of shares granted  
Exercised (341,300)
Forfeited and cancelled (477,611)
Outstanding as of June 30, 2015 638,403
Weighted-Average Exercise Price  
Outstanding as of January 1, 2015 $ 19.00
Granted  
Exercised $ 19.00
Forfeited and cancelled 19.00
Outstanding as of June 30, 2015 $ 19.00