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Business and Property Management Agreements with RMR LLC (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
employee
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
agreement
employee
Sep. 30, 2020
USD ($)
Related person transactions        
Number of employees | employee 0   0  
Related party transaction business management agreement, annual incentive fee estimate included in management fees     $ 0 $ 0
Property management and construction supervision fees $ 2,931,000 $ 3,477,000 9,276,000 10,076,000
Property management and construction supervision fees paid 3,121,000 3,571,000 9,620,000 10,433,000
RMR LLC        
Related person transactions        
Business management fees incurred 5,986,000 5,004,000 17,627,000 15,614,000
Related party transaction business management fees related to subsidiary level management     $ 725,000 2,175,000
Related party transaction business management agreement, annual incentive fee estimate included in management fees 0 0    
Period of actual amount of incentive fees     3 years  
Property management and construction supervision fees 2,410,000 2,496,000 $ 7,360,000 7,573,000
Party transaction property management and construction supervision fees capitalized $ 521,000 $ 981,000 $ 1,916,000 $ 2,503,000
Property management fee 3.00%   3.00%  
Senior Living Communities | RMR LLC        
Related person transactions        
Number of consecutive renewal terms of agreement | agreement     2