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Shareholders' Equity - Common Share Awards Narrative (Details)
$ in Thousands
12 Months Ended
Feb. 27, 2020
USD ($)
trustee
shares
Apr. 12, 2018
USD ($)
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Common Share Issuances          
Number of new trustees | trustee 2        
Officers and employees of RMR          
Common Share Issuances          
Common shares granted under equity compensation plan (in shares) | shares     264,400 140,100 97,000
Stock granted value     $ 2,232 $ 3,507 $ 2,810
Vesting period     5 years    
Trustee One | Common Shares          
Common Share Issuances          
Common shares granted under equity compensation plan (in shares) | shares 3,000   5,000    
Stock granted value $ 112   $ 378    
Stock granted value per trustee     $ 54    
Trustee Two | Common Shares          
Common Share Issuances          
Common shares granted under equity compensation plan (in shares) | shares 3,000   5,000    
Stock granted value $ 112   $ 378    
Stock granted value per trustee     $ 54    
Trustees | Common Shares          
Common Share Issuances          
Common shares granted under equity compensation plan (in shares) | shares   3,000 3,000 3,000 3,000
Stock granted value   $ 75 $ 370 $ 427  
Stock granted value per trustee     $ 74 $ 85