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Related Person Transactions (Details)
$ in Thousands
1 Months Ended 9 Months Ended
Sep. 24, 2018
shares
Sep. 13, 2018
shares
Sep. 30, 2018
USD ($)
agreement
shares
Sep. 30, 2017
shares
Mar. 31, 2017
building
Sep. 30, 2018
USD ($)
building
agreement
shares
Dec. 31, 2017
USD ($)
Related person transactions              
Number of buildings included in joint venture agreement | building         2    
RMR Inc | Class A common shares              
Related person transactions              
Equity securities investment (in shares)     2,637,408     2,637,408  
Number of management agreements | agreement     2     2  
Five Star              
Related person transactions              
Equity securities investment (in shares)     4,235,000     4,235,000  
Investment owned, percentage of total shares outstanding     8.40%     8.40%  
Employees Of RMR LLC              
Related person transactions              
Shares issued in period (in shares)   105,800 105,800 88,100      
Shares purchased to satisfy tax withholding and payment obligations (in shares) 18,121   18,121 16,654      
AIC              
Related person transactions              
Property insurance annual premium | $           $ 4,413  
Equity method investments | $     $ 9,157     $ 9,157 $ 8,185
RMR LLC | Five Star              
Related person transactions              
Investment owned, percentage of total shares outstanding     35.60%     35.60%  
MOBs              
Related person transactions              
Standalone insurance policy coverage period           1 year  
Number of buildings included in joint venture agreement | building           2