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Leases and Management Agreements with Five Star - Narrative (Details) $ in Thousands		1 Months Ended	3 Months Ended		6 Months Ended
	Jun. 09, 2021 USD ($) unit community	Jan. 31, 2021 USD ($)	Jun. 30, 2021 USD ($) property trustee community shares	Jun. 30, 2020 USD ($) community	Jun. 30, 2021 USD ($) property trustee community shares	Jun. 30, 2020 USD ($) community	Aug. 03, 2021 community	Dec. 31, 2020 shares	Dec. 31, 2019 shares
Common shares of beneficial interest, shares issued (in shares) | shares			238,374,572		238,374,572			238,268,478
Gain on lease termination			$ 0	$ 0	$ 0	$ 22,896
Number of properties (property) | property			392		392
Rental income			$ 398	$ 488	$ 795	782
Five Star
Total rental income recognized						75,000
Gain on lease termination						$ 22,896
Five Star
Payments made in exchange for customary release		$ 5,763
Five Star | Senior Living Communities
Number of properties (property) | community			235	241	235	241
Number of real estate properties inadequate documentation | trustee			1		1
Revenue reserve, management fees payable reduction					$ 115
Five Star | Senior Living Communities | Closed
Number of properties (property) | community			7		7
Five Star
Common shares of beneficial interest, shares issued (in shares) | shares									10,268,158
Aggregate Shares Issued | shares									16,118,849
Five Star
Investment owned, percentage of total shares outstanding			33.70%		33.70%
Property management agreement expense			$ 12,927	$ 15,706	$ 26,777	$ 32,756
Related party transaction capitalized amount			715	444	1,549	906
Five Star | Operating Expense
Property management agreement expense			12,212	15,262	25,228	31,850
Five Star | Senior Living Communities
Number of properties (property) | community	120
Number of property units (units) | unit	18,000
Related party transactions, termination percentage	10.00%
Percentage target EBITDA of new management agreement not earned	80.00%
Five Star | Senior Living Communities | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations
Total rental income recognized	$ 682,000		11,914		11,914
Number of property units (units) | unit	7,500
Five Star | Senior Living Communities | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations | Scenario, Plan
Number of properties (property) | community	108
Five Star | Senior Living Communities | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations | Subsequent Event
Number of properties (property) | community							76
Number of managers | community							4
Five Star | Senior Living Communities | Closed
Number of property units (units) | unit	1,500
Five Star | Rehabilitation Services
Expenses from transactions with related party			$ 2,630	$ 5,814	$ 8,071	$ 13,871
Five Star | Third Party Investor | Senior Living Communities | Disposal Group, Disposed of by Means Other than Sale, Not Discontinued Operations | Subsequent Event
Number of properties (property) | community							41

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