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
3 Months Ended
Mar. 31, 2018
$ / shares
shares
Time-Based Awards  
Number of Restricted Share Awards  
Non-vested as of January 1, 2018 | shares 2,555,477
Granted | shares 1,606,156
Vested | shares (938,637)
Forfeited or expired | shares (39,872)
Non-vested and expected to vest as of March 31, 2018 | shares 3,183,124
Weighted- Average Grant-Date Fair Value  
Non-vested as of January 1, 2018 | $ / shares $ 50.86
Granted | $ / shares 56.74
Vested | $ / shares 56.68
Forfeited or expired | $ / shares 52.72
Non-vested and expected to vest as of March 31, 2018 | $ / shares $ 53.90
Performance-Based Awards  
Number of Restricted Share Awards  
Non-vested as of January 1, 2018 | shares 0
Granted | shares 843,998
Vested | shares 0
Forfeited or expired | shares (12,500)
Non-vested and expected to vest as of March 31, 2018 | shares 831,498
Weighted- Average Grant-Date Fair Value  
Non-vested as of January 1, 2018 | $ / shares $ 0.00
Granted | $ / shares 56.58
Vested | $ / shares 0.00
Forfeited or expired | $ / shares 59.43
Non-vested and expected to vest as of March 31, 2018 | $ / shares $ 55.94
Market-Based Awards  
Number of Restricted Share Awards  
Non-vested as of January 1, 2018 | shares 50,000
Granted | shares 0
Vested | shares 0
Forfeited or expired | shares 0
Non-vested and expected to vest as of March 31, 2018 | shares 50,000
Weighted- Average Grant-Date Fair Value  
Non-vested as of January 1, 2018 | $ / 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 March 31, 2018 | $ / shares $ 59.43