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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Mar. 31, 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 250,000,000 250,000,000
Common stock, shares issued 141,104,587 140,993,985
Common Stock, shares outstanding 141,104,587 140,993,985