Quarterly report pursuant to Section 13 or 15(d)

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

v3.7.0.1
Employee Benefits and Compensation Plans - Summary of Restricted Unit Activity (Details 2) - Restricted share units
6 Months Ended
Jun. 30, 2017
$ / shares
shares
Time-Based Awards  
Number of Restricted Share Awards  
Non-vested as of January 1, 2017 | shares 1,305,335
Granted | shares 1,750,612
Vested | shares (440,508)
Forfeited or Expired | shares (36,507)
Non-vested and expected to vest as of June 30, 2017 | shares 2,578,932
Weighted- Average Grant-Date Fair Value  
Non-vested as of January 1, 2017 | $ / shares $ 50.38
Granted | $ / shares 50.96
Vested | $ / shares 50.67
Forfeited or Expired | $ / shares 50.61
Non-vested and expected to vest as of June 30, 2017 | $ / shares $ 50.72
Performance-Based Awards  
Number of Restricted Share Awards  
Non-vested as of January 1, 2017 | shares
Granted | shares 37,500
Vested | shares (15,000)
Forfeited or Expired | shares (22,500)
Non-vested and expected to vest as of June 30, 2017 | shares
Weighted- Average Grant-Date Fair Value  
Non-vested as of January 1, 2017 | $ / shares
Granted | $ / shares 49.76
Vested | $ / shares 49.76
Forfeited or Expired | $ / shares 49.76
Non-vested and expected to vest as of June 30, 2017 | $ / shares
Market-Based Awards  
Number of Restricted Share Awards  
Non-vested as of January 1, 2017 | shares 50,000
Non-vested and expected to vest as of June 30, 2017 | shares 50,000
Weighted- Average Grant-Date Fair Value  
Non-vested as of January 1, 2017 | $ / shares $ 59.43
Non-vested and expected to vest as of June 30, 2017 | $ / shares $ 59.43