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Stockholders' Equity - Share Activity by Class of Stock (Details) - shares
6 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance (in shares) 77,801,854  
Shares issued (in shares) 0  
Restricted share award net share settlement (in shares) (126,971)  
Delivery of Shares Underlying RSUs (in shares) 24,233  
Ending balance (in shares) 78,575,100  
Class A Common Stock    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance (in shares) 56,429,825  
Restricted share award net share settlement (in shares) (126,971)  
Delivery of Shares Underlying RSUs (in shares) 24,233  
Ending balance (in shares) 61,354,644  
Class B Common Stock    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance (in shares) 7,803,364  
Restricted share award net share settlement (in shares) 0  
Delivery of Shares Underlying RSUs (in shares) 0  
Ending balance (in shares) 5,589,292  
Class C Common Stock    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning balance (in shares) 13,568,665  
Restricted share award net share settlement (in shares) 0  
Delivery of Shares Underlying RSUs (in shares) 0  
Ending balance (in shares) 11,631,164  
Restricted Stock    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Shares issued (in shares) 916,085  
Granted (in shares) 919,455  
Restricted Stock | Class A Common Stock    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Shares issued (in shares) 916,085  
Restricted Stock | Class B Common Stock    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Shares issued (in shares) 0  
Restricted Stock | Class C Common Stock    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Shares issued (in shares) 0  
Restricted Stock Units RSUs    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Restricted stock units outstanding (in shares) 304,570 297,891
Granted (in shares) 3,370  
Performance Shares    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Shares issued in period (in shares) 60,000  
Granted (in shares) 60,000  
Common Stock    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Holdings Common Unit Exchanges (in shares) 0  
Common Stock | Class A Common Stock    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Holdings Common Unit Exchanges (in shares) (2,349,247)  
Common Stock | Class B Common Stock    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Holdings Common Unit Exchanges (in shares) (403,941)  
Common Stock | Class C Common Stock    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Holdings Common Unit Exchanges (in shares) (1,945,306)  
Common Stock    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Employee/Partner Terminations (in shares) (40,101)  
Common Stock | Class A Common Stock    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Employee/Partner Terminations (in shares) (40,101)  
Common Stock | Class B Common Stock    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Employee/Partner Terminations (in shares) (32,805)  
Common Stock | Class C Common Stock    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Employee/Partner Terminations (in shares) (32,805)  
Follow On Offering    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Shares issued (in shares) 0  
Follow On Offering | Class A Common Stock    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Shares issued (in shares) 1,802,326  
Follow On Offering | Class B Common Stock    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Shares issued (in shares) 1,777,326  
Follow On Offering | Class C Common Stock    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Shares issued (in shares) 25,000