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Employee Equity-Based Compensation - Stock Option Supplemental Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Options Outstanding    
Number of options (shares) 8,182,384 7,328,131
Weighted average remaining contractual term (in years) 6 years 18 days  
Weighted average exercise price (dollars per share) $ 12.34 $ 10.16
Weighted average fair value (dollars per share) $ 8.57  
Aggregate intrinsic value (in thousands) $ 91,273  
Options Exercisable    
Number of options (shares) 5,751,558  
Weighted average remaining contractual term (in years) 4 years 11 months 12 days  
Weighted average exercise price (dollars per share) $ 8.26  
Weighted average fair value (dollars per share) $ 5.83  
Aggregate intrinsic value (in thousands) $ 85,694