Quarterly report pursuant to Section 13 or 15(d)

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

v3.8.0.1
Employee Benefits and Compensation Plans - Summary of Restricted Unit Activity (Details 2) - Restricted share units
9 Months Ended
Sep. 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 1,803,327
Vested | shares (447,503)
Forfeited or expired | shares (70,179)
Non-vested and expected to vest as of September 30, 2017 | shares 2,590,980
Weighted- Average Grant-Date Fair Value  
Non-vested as of January 1, 2017 | $ / shares $ 50.38
Granted | $ / shares 51.13
Vested | $ / shares 50.55
Forfeited or expired | $ / shares 50.71
Non-vested and expected to vest as of September 30, 2017 | $ / shares $ 50.86
Performance-Based Awards  
Number of Restricted Share Awards  
Non-vested as of January 1, 2017 | shares 0
Granted | shares 37,500
Vested | shares (15,000)
Forfeited or expired | shares (22,500)
Non-vested and expected to vest as of September 30, 2017 | shares 0
Weighted- Average Grant-Date Fair Value  
Non-vested as of January 1, 2017 | $ / shares $ 0.00
Granted | $ / shares 49.76
Vested | $ / shares 49.76
Forfeited or expired | $ / shares 49.76
Non-vested and expected to vest as of September 30, 2017 | $ / shares $ 0.00
Market-Based Awards  
Number of Restricted Share Awards  
Non-vested as of January 1, 2017 | shares 50,000
Granted | shares 0
Vested | shares 0
Forfeited or expired | shares 0
Non-vested and expected to vest as of September 30, 2017 | shares 50,000
Weighted- Average Grant-Date Fair Value  
Non-vested as of January 1, 2017 | $ / shares $ 59.43
Granted | $ / shares 0.00
Vested | $ / shares 0.00
Forfeited or expired | $ / shares 0.00
Non-vested and expected to vest as of September 30, 2017 | $ / shares $ 59.43