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Beneficial Interest - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Beneficial Interest      
Common shares, outstanding 9,610,000   9,436,000
Preferred shares, outstanding 0   0
Dividends paid $ 0.5294 $ 0.5225  
Dividends payable $ 7,371   $ 7,118
Total Beneficial Interest      
Beneficial Interest      
Common shares, authorized 100,000,000    
Common shares, par value $ 0.01    
Preferred shares, authorized 50,000,000    
Preferred shares, par value $ 0.01    
Dividends payable $ 2,544 $ 2,405