Business and Property Management Agreements with RMR-Schedule of Business Management Fees, Property Management Fees and Construction Supervision Fees Recognized (Details) - RMR LLC - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pursuant to business management agreement:
Business management fees	$ 16,468	$ 13,965	$ 16,646
Pursuant to property management agreement
Property management fees	5,683	5,686	5,657
Construction supervision fees	2,005	3,200	4,672
Total property management and construction supervision fees	7,688	8,886	10,329
Expense Reimbursement:
Property level expenses	15,023	14,587	12,901
Recognized amortization of the liability	2,974	2,974	2,974
Amortization of liability related to property management and construction supervision fees	797	797	797
General and administrative expenses
Expense Reimbursement:
Property level expenses	304	288	243
Property operating expenses
Expense Reimbursement:
Property level expenses	$ 14,719	$ 14,299	$ 12,658