XML 14 R3.htm IDEA: XBRL DOCUMENT v3.19.1
CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Mar. 31, 2019
Dec. 31, 2018
Preferred stock, par value (usd per share) $ 0.00001 $ 0.00001
Preferred stock, shares authorized (in shares) 50,000,000 50,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Treasury stock, shares held (in shares) 15,930,963 11,554,084
Class A Common Stock    
Common stock, par value (usd per share) $ 0.00001 $ 0.00001
Common stock, shares authorized (in shares) 400,000,000 400,000,000
Common stock, shares issued (in shares) 124,997,685 124,519,942
Common stock, shares outstanding (in shares) 109,066,720 112,965,856
Class B Common Stock    
Common stock, par value (usd per share) $ 0.00001 $ 0.00001
Common stock, shares authorized (in shares) 200,000,000 200,000,000
Common stock, shares issued (in shares) 0 0
Common stock, shares outstanding (in shares) 0 0