Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details)

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Stockholders' Equity (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Nov. 30, 2019
Class of Stock [Line Items]      
Stock repurchase program, authorized amount     $ 5.0
Economic interest percentage 38.20%    
Non-controlling interest holders      
Class of Stock [Line Items]      
Economic interest percentage 61.80%    
Class B Common Stock      
Class of Stock [Line Items]      
Antidilutive securities (in shares) 2,443,437 5,869,778  
Class C Common Stock      
Class of Stock [Line Items]      
Antidilutive securities (in shares) 72,064,218 77,791,218  
Stock Options      
Class of Stock [Line Items]      
Antidilutive securities (in shares) 1,521,137 745,784