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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares
Sep. 30, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 450,000,000 450,000,000
Common stock, shares issued (in shares) 238,639,488 237,201,064
Common stock, shares outstanding (in shares) 237,312,881 236,344,172
Treasury stock, shares (in shares) 1,326,607 856,892