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Condensed Consolidated Balance Sheets (Unaudited) - Parenthetical - $ / shares
shares in Thousands
Sep. 30, 2021
Dec. 31, 2020
Class A Common Stock    
Common stock par value (in dollars per share) $ 0.01 $ 0.01
Common stock shares authorized (in shares) 300,000 300,000
Common stock shares issued (in shares) 19,786 18,304
Common stock shares outstanding (in shares) 19,786 18,304
Class B Common Stock    
Common stock par value (in dollars per share) $ 0.01 $ 0.01
Common stock shares authorized (in shares) 50,000 50,000
Common stock shares issued (in shares) 17,239 18,447
Common stock shares outstanding (in shares) 17,239 18,447