Quarterly report pursuant to Section 13 or 15(d)

Employee Benefits and Share Option Plans - Summary of Restricted Unit Activity (Details 2)

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Employee Benefits and Share Option Plans - Summary of Restricted Unit Activity (Details 2) - Restricted share units
9 Months Ended
Sep. 30, 2015
$ / shares
shares
Time-Based Awards  
Number of Restricted Share Awards  
Non-vested as of January 1, 2015 | shares
Granted | shares 150,000
Vested | shares
Forfeited or Expired | shares
Non-vested and expected to vest as of September 30, 2015 | shares 150,000
Weighted- Average Grant-Date Fair Value  
Non-vested as of January 1, 2015
Granted $ 59.43
Vested
Forfeited or Expired
Non-vested and expected to vest as of September 30, 2015 $ 59.43
Performance-Based Awards  
Number of Restricted Share Awards  
Non-vested as of January 1, 2015 | shares
Granted | shares 50,000
Vested | shares
Forfeited or Expired | shares
Non-vested and expected to vest as of September 30, 2015 | shares 50,000
Weighted- Average Grant-Date Fair Value  
Non-vested as of January 1, 2015
Granted $ 59.43
Vested
Forfeited or Expired
Non-vested and expected to vest as of September 30, 2015 $ 59.43