v3.19.3.a.u2
CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Dec. 31, 2019
Dec. 31, 2018
Common stock (temporary equity), par value (in dollars per share) $ 0.01 $ 0.01
Common stock (temporary equity), shares issued (in shares) 0 75,712
Common stock (temporary equity), shares outstanding (in shares) 0 38,943
Treasury stock, shares 3,732,625 3,732,625
Class A common stock    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, share authorized (in shares) 524,173,073 524,173,073
Common stock, shares issued (in shares) 55,812,702 55,401,325
Common stock, shares outstanding (in shares) 52,080,077 51,705,469
Class B common stock    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, share authorized (in shares) 51,769,784 51,769,784
Common stock, shares issued (in shares) 51,769,784 51,769,784
Common stock, shares outstanding (in shares) 51,769,784 51,769,784