Annual report pursuant to Section 13 and 15(d)

CONSOLIDATED BALANCE SHEETS (Parenthetical)

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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Dec. 31, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Preferred shares of beneficial interest, par value (in dollars per share) $ 0.01 $ 0.01
Preferred shares of beneficial interest, authorized (in shares) 50,000,000 50,000,000
Preferred shares of beneficial interest, issued (in shares) 8,736,719 8,732,719
Preferred shares of beneficial interest, outstanding (in shares) 8,736,719 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) 91,198,929 71,293,117
Common shares of beneficial interest, outstanding (in shares) 91,198,929 71,293,117