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Share-Based Compensation - Summary of Restricted Stock Units Activity (Details) - Restricted Stock Units (RSUs)
3 Months Ended
Mar. 31, 2017
$ / shares
shares
Number of Shares  
Non-vested at December 31, 2016 (in shares) 708,695
Granted (in shares) 473,949
Vested (in shares) (62,795)
Forfeited (in shares) (8,451)
Non-vested at March 31, 2017 (in shares) 1,111,398
Weighted Average Grant Date Fair Value  
Granted (in USD per share) | $ / shares $ 51.55