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Consolidated Balance Sheets (Parenthetical) - $ / shares
Dec. 31, 2017
Dec. 31, 2016
EQUITY    
Common shares, shares issued (in shares) 101,118,289 101,080,673
Common shares, shares outstanding (in shares) 101,118,289 101,080,673
Common shares, par value (in dollars per share) $ 1.00 $ 1