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Shareholders' Equity - Share Awards (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Share Award Plan        
Distributions        
Common shares reserved for issuance (in shares) 217,189      
Award Plans        
Distributions        
Unvested (in shares) 1,024,441 609,960 588,830 425,030
2025 (in shares) 320,980      
2026 (in shares) 289,362      
2027 (in shares) 239,080      
2028 (in shares) 175,019      
Estimated future compensation expense for unvested shares $ 5,021      
Weighted average period over which the compensation expense (in months) 24 months      
Compensation expense $ 3,620 $ 3,417 $ 2,775  
Officers and Employees of RMR | Common Stock        
Distributions        
Vesting period (in installments) 5 years