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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares
Sep. 30, 2020
Dec. 31, 2019
Class A common stock    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Class B common stock    
Common stock, par value (in dollars per share) 0.01 0.01
Class C common stock    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01