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Business and Property Management Agreements with RMR LLC - Net Business Management Fees (Details) - RMR LLC
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Jan. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
agreement
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
agreement
Jun. 30, 2016
USD ($)
Internal audit expense          
Real Estate Properties [Line Items]          
Related party costs and expenses   $ 67 $ 67 $ 135 $ 134
Amended and restate business management agreement          
Real Estate Properties [Line Items]          
Number of management service agreements | agreement   2   2  
Business management fees incurred   $ 27,892 34,825 $ 57,661 48,605
Estimated incentive fees recorded   17,750 25,920 37,370 31,236
Incentive fees paid $ 52,407        
Related party property management and construction management fee   10 12 21 26
Related party reimbursement expenses   $ 45 $ 46 $ 91 $ 84