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Consolidated Balance Sheets (Parenthetical) - $ / shares
Dec. 31, 2017
Dec. 31, 2016
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 380,104,970 378,637,403
Common stock, shares outstanding 380,104,970 378,637,403