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Consolidated Balance Sheets (Parenthetical) - $ / shares
Mar. 31, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 1,000,000,000 1,000,000,000
Common stock, shares issued 318,888,569 318,417,821
Common stock, shares outstanding 313,973,538 316,146,114
Treasury Stock, Common, Shares 4,915,031 2,271,707