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Business and Property Management Agreements with RMR (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
employee
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
employee
jointVenture_arrangement
property
agreement
Sep. 30, 2022
USD ($)
Related person transactions        
Number of employees | employee 0   0  
Property management and construction supervision fees $ 2,209 $ 2,658 $ 6,403 $ 7,567
Property management and construction supervision fees paid 3,671 3,498 10,765 9,573
RMR        
Related person transactions        
Business management fees incurred 3,692 3,763 $ 10,283 13,082
Period of actual amount of incentive fees     3 years  
Property management and construction supervision fees 1,363 1,521 $ 4,226 4,142
Party transaction property management and construction supervision fees capitalized $ 846 $ 1,137 $ 2,177 $ 3,425
Number joint venture arrangements | jointVenture_arrangement     2  
Number of medical office and life science properties | property     10  
Senior Living Communities | RMR        
Related person transactions        
Number of consecutive renewal terms of agreement | agreement     2