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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - $ / shares
Mar. 31, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Common shares, par value (in dollars per share) $ 0.01 $ 0.01
Common shares, shares authorized (in shares) 200,000,000 200,000,000
Common shares, shares issued (in shares) 164,441,709 164,441,709
Common shares, shares outstanding (in shares) 164,441,709 164,441,709