Quarterly report pursuant to Section 13 or 15(d)

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical)

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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - $ / shares
Mar. 31, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Series A Preferred shares of beneficial interest, par value (in dollars per share) $ 0.01 $ 0.01
Series A Preferred shares of beneficial interest, authorized (in shares) 50,000,000 50,000,000
Series A Preferred shares of beneficial interest, issued (in shares) 8,732,719 8,732,719
Series A Preferred shares of beneficial interest, outstanding (in shares) 8,732,719 8,732,719
Common shares of beneficial interest, par value (in dollars per share) $ 0.01 $ 0.01
Common shares of beneficial interest, authorized (in shares) 250,000,000 250,000,000
Common shares of beneficial interest, issued (in shares) 75,186,127 71,293,117
Common shares of beneficial interest, outstanding (in shares) 75,186,127 71,293,117