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Condensed Consolidated Balance Sheet (Unaudited) (Parenthetical) - $ / shares
Mar. 31, 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) 238,691,038 237,201,064
Common stock, shares outstanding (in shares) 237,461,470 236,344,172
Treasury stock, shares (in shares) 1,229,568 856,892