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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Mar. 31, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Common shares of beneficial interest, par value (in dollars per share) $ 0.01 $ 0.01
Common shares of beneficial interest, shares authorized (in shares) 300,000,000 300,000,000
Common shares of beneficial interest, shares issued (in shares) 238,268,478 238,268,478
Common shares of beneficial interest, shares outstanding (in shares) 238,268,478 238,268,478