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Leases and Management Agreements with Five Star - Narrative (Details) $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
	Apr. 01, 2019 USD ($)	Sep. 30, 2020 USD ($) property trustee building shares	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) building property trustee community renewal_option shares	Sep. 30, 2019 USD ($) community	Dec. 31, 2019 community shares	Jan. 01, 2020 shares	Feb. 01, 2019 USD ($)
Common shares of beneficial interest, shares issued (in shares) | shares		238,268,478		238,268,478		237,897,163
Gain on lease termination		$ 0	$ 0	$ 22,896	$ 0
Number of real estate properties scheduled for closure | property		10		10
Rental income		$ 393		$ 1,175
Senior Living Communities
Payments to acquire assets	$ 49,155				49,155
Five Star
Total rental income recognized				$ 75,000
Monthly minimum rent payable								$ 11,000
Management fees as percentage of gross revenues		5.00%		5.00%
Percentage of annual incentive fee		15.00%		15.00%
Percentage of gross revenues realized at all communities		1.50%		1.50%
Number of consecutive renewal terms of agreement | renewal_option				2
Property management agreement, renewal term				5 years
Percentage target EBITDA of new management agreement not earned				90.00%
Percentage target EBITDA of new management agreement not earned for all communities				20.00%
Amount of improvements to communities					$ 97,480
Five Star
Annual rent plus percentage		4.00%		4.00%
Five Star | Senior Living Communities
Number of communities managed by related party | community				239	77
Number of real estate properties inadequate documentation | trustee		1		1
Revenue reserve for inadequate documentation				$ 4,005
Estimated penalties, compliance costs, and professional fees, net of management fees reimbursable		$ 2,167		$ 2,167
Number of real estate properties scheduled for closure | building		10		10
Five Star
Common shares of beneficial interest, shares issued (in shares) | shares						10,268,158	10,268,158
Five Star | Shareholders
Common shares of beneficial interest, shares issued (in shares) | shares						16,118,849	16,118,849
Five Star
Number of communities leased by the company | community						166
Number of communities managed by related party | community						78
Total rental income recognized			32,738		$ 105,451
Investment owned, percentage of total shares outstanding		33.90%		33.90%
Annual rent as a percentage					538
Property management agreement expense		$ 15,182	$ 3,832	$ 47,937	$ 11,492
Five Star | Rental income | Rents from significant lessee | Investment
Percentage of rental income			12.80%		13.40%
Five Star | Rental Property Concentration | Rents from significant lessee | Investment
Percentage of rental income					27.00%
Five Star | Rehabilitation Services
Expenses from transactions with related party		$ 5,972	$ 1,478	$ 19,843	$ 4,666

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