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Business and Property Management Agreements with RMR LLC (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
employee
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
agreement
employee
Jun. 30, 2020
USD ($)
Dec. 31, 2020
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 $ 3,191,000 $ 3,407,000 6,345,000 6,599,000  
Property management and construction supervision fees paid 3,202,000 3,419,000 6,499,000 6,862,000  
RMR LLC          
Related person transactions          
Business management fees incurred 6,324,000 4,841,000 11,641,000 10,610,000  
Related party transaction business management fees related to subsidiary level management     725,000 1,450,000  
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 2,465,000 2,481,000 4,950,000 5,077,000  
Party transaction property management and construction supervision fees capitalized $ 726,000 $ 926,000 $ 1,395,000 $ 1,522,000  
Property management fee 3.00%   3.00%    
Senior Living Communities | RMR LLC          
Related person transactions          
Number of consecutive renewal terms of agreement | agreement     2