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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Dec. 31, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Common shares, par value (in dollars per share) $ 0.01 $ 0.01
Common shares, shares authorized (in shares) 300,000,000 300,000,000
Common shares, shares issued (in shares) 237,729,900 237,630,409
Common shares, shares outstanding (in shares) 237,729,900 237,630,409