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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Sep. 30, 2015
Dec. 31, 2014
CONDENSED CONSOLIDATED BALANCE SHEETS    
Common shares of beneficial interest, par value (in dollars per share) $ 0.01 $ 0.01
Common shares of beneficial interest, shares authorized 300,000,000 300,000,000
Common shares of beneficial interest, shares issued 237,471,559 203,910,305
Common shares of beneficial interest, shares outstanding 237,471,559 203,910,305