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Condensed Consolidated Balance Sheets (Unaudited) Parenthetical - $ / shares
Jun. 30, 2019
Dec. 31, 2018
Class A Common Stock    
Common stock par value (in dollars per share) $ 0.01 $ 0.01
Common stock shares authorized (in shares) 300,000,000 300,000,000
Common stock shares issued (in shares) 15,013,000 13,800,000
Common stock shares outstanding (in shares) 15,013,000 13,800,000
Class B Common Stock    
Common stock par value (in dollars per share) $ 0.01 $ 0.01
Common stock shares authorized (in shares) 50,000,000 50,000,000
Common stock shares issued (in shares) 21,275,000 22,486,000
Common stock shares outstanding (in shares) 21,275,000 22,486,000