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Employee Equity-Based Compensation - Stock Option Supplemental Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Options Outstanding    
Number of options (shares) 7,506,043 6,857,124
Weighted average remaining contractual term (in years) 6 years 6 months 22 days  
Weighted average exercise price (dollars per share) $ 9.80 $ 7.72
Weighted average fair value (dollars per share) $ 7.28  
Aggregate intrinsic value (in thousands) $ 131,115  
Options Exercisable    
Number of options (shares) 5,070,585  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term 5 years 7 months 6 days  
Weighted average exercise price (dollars per share) $ 5.73  
Weighted average fair value (dollars per share) $ 4.33  
Aggregate intrinsic value (in thousands) $ 109,601