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Shareholders' Equity - Schedule of Share Awarded to Trustees, Officers and Other Employees of RMR (Details) - Share Award Plans - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares (in shares)	1,747,861	1,031,329	438,000
Weighted Average Grant Date Fair Value (in dollars per share)	$ 2.77	$ 4.50	$ 7.88
Weighted Average Value of Grants	$ 4,842	$ 4,641	$ 3,451

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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