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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Common shares, par value $ 0.01 $ 0.01 $ 0.01
Series B Preferred Shares [Member]      
Preferred shares, par value 0.01 $ 0.01 $ 0.01
Series C Preferred Shares [Member]      
Preferred shares, par value $ 0.01