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Business and Property Management Agreements with RMR (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
employee
agreement
Mar. 31, 2021
USD ($)
Dec. 31, 2021
Related person transactions      
Number of employees | employee 0    
Related party transaction business management agreement, annual incentive fee estimate included in management fees $ 0 $ 0  
Property management and construction supervision fees 2,391,000 3,154,000  
Property management and construction supervision fees paid 2,964,000 3,297,000  
RMR      
Related person transactions      
Business management fees incurred 4,813,000 5,317,000  
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 1,349,000 2,485,000  
Party transaction property management and construction supervision fees capitalized $ 1,042,000 $ 669,000  
Property management fee 3.00%    
Senior Living Communities | RMR      
Related person transactions      
Number of consecutive renewal terms of agreement | agreement 2