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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares
Jun. 30, 2018
Dec. 31, 2017
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) 320,010,534 270,627,014
Common stock, shares outstanding (in shares) 317,985,056 269,295,466
Treasury stock, shares (in shares) 2,025,478 1,331,548