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Consolidated Balance Sheets (Parenthetical) - $ / shares
Mar. 31, 2020
Dec. 31, 2019
Treasury stock (in shares) 2,356,050 3,184,269
Class A Common Stock    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, authorized (in shares) 600,000,000 600,000,000
Common stock, issued (in shares) 110,693,832 110,693,832
Common stock, outstanding (in shares) 108,337,782 107,509,563
Class B Common Stock    
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, authorized (in shares) 100,000,000 100,000,000
Common stock, issued (in shares) 12,158,933 12,158,933
Common stock, outstanding (in shares) 12,158,933 12,158,933