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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
Jun. 30, 2014
Dec. 31, 2013
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 220,000,000 220,000,000
Common shares of beneficial interest, shares issued 203,755,980 188,167,643
Common shares of beneficial interest, shares outstanding 203,755,980 188,167,643