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Employee Equity-Based Compensation - Stock Option Supplemental Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Options Outstanding    
Number of options (shares) 10,159,345 8,090,636
Weighted average remaining contractual term (in years) 6 years 1 month 20 days  
Weighted average exercise price (dollars per share) $ 12.34 $ 12.22
Weighted average fair value (dollars per share) $ 8.01  
Aggregate intrinsic value (in thousands) $ 76,923  
Options Exercisable    
Number of options (shares) 6,137,856  
Weighted average remaining contractual term (in years) 4 years 3 months 25 days  
Weighted average exercise price (dollars per share) $ 9.03  
Weighted average fair value (dollars per share) $ 6.06  
Aggregate intrinsic value (in thousands) $ 65,271