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Shareholders' Equity - Narrative (Details) $ / shares in Units, $ in Thousands					6 Months Ended
	Jul. 15, 2021 USD ($) $ / shares	Jun. 03, 2021 trustee $ / shares shares	May 20, 2021 USD ($)	Feb. 18, 2021 USD ($)	Jun. 30, 2021 USD ($) shares	Jun. 30, 2020 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award
Number of trustees | trustee		6
Distributions to shareholders | $			$ 2,383	$ 2,383	$ 4,766	$ 38,063
Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award
Distributions to common shareholders declared (in dollars per share) | $ / shares	$ 0.01
Distributions to shareholders | $	$ 2,384
Former Employees Of RMR LLC
Share-based Compensation Arrangement by Share-based Payment Award
Number of shares (in shares) | shares					13,906
Trustees
Share-based Compensation Arrangement by Share-based Payment Award
Common shares awarded (in shares) | shares		20,000
Common shares awarded, par value (in dollars per share) | $ / shares		$ 3.70

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