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Employee Equity-Based Compensation - Stock Option Supplemental Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Options Outstanding    
Number of options (shares) 9,102,010 8,090,636
Weighted average remaining contractual term (in years) 5 years 9 months 29 days  
Weighted average exercise price (dollars per share) $ 11.80 $ 12.22
Weighted average fair value (dollars per share) $ 7.85  
Aggregate intrinsic value (in thousands) $ 104,986  
Options Exercisable    
Number of options (shares) 6,096,976  
Weighted average remaining contractual term (in years) 4 years 5 months 19 days  
Weighted average exercise price (dollars per share) $ 8.94  
Weighted average fair value (dollars per share) $ 6.03  
Aggregate intrinsic value (in thousands) $ 86,768