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Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares
Mar. 31, 2019
Dec. 31, 2018
Statement Of Financial Position [Abstract]    
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 280,000,000 280,000,000
Common stock, shares issued 187,778,236 187,029,967
Common stock, shares outstanding 187,778,236 187,029,967