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Related Person Transactions (Details) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
	Feb. 02, 2023 $ / shares	Sep. 30, 2023 USD ($) agreement	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) agreement	Sep. 30, 2022 USD ($)	Mar. 20, 2023
Related person transactions
Revenues		$ 356,524	$ 322,920	$ 1,048,773	$ 946,681
Rental income
Related person transactions
Revenues		63,390	63,960	191,201	191,767
Reit Management And Research L L C | Rental income
Related person transactions
Revenues		$ 58	$ 77	132	$ 225
AlerisLife Inc | AlerisLife Inc
Related person transactions
Noncontrolling interest, ownership percentage by parent						6.10%
AlerisLife Inc
Related person transactions
Investment owned balance per shares | $ / shares	$ 1.31
Investment sale, percentage of investee equity eligible for sale	31.90%
Related Party | Reit Management And Research L L C
Related person transactions
Related party transaction, closing cost				$ 6,080
Number of management agreements | agreement		2		2
Related Party | AlerisLife Inc
Related person transactions
Investment owned, percentage of total shares outstanding						31.90%

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