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Related Person Transactions (Details) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
	Feb. 02, 2023 $ / shares shares	Jun. 30, 2023 USD ($) agreement	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) agreement	Jun. 30, 2022 USD ($)	Mar. 20, 2023 shares
Related person transactions
Revenues		$ 346,219	$ 313,028	$ 692,249	$ 623,761
AlerisLife Inc
Related person transactions
Investment owned balance per shares | $ / shares	$ 1.31
Investment sale, percentage of investee equity eligible for sale	31.90%
Rental income
Related person transactions
Revenues		61,373	62,522	127,811	127,807
Reit Management And Research L L C | Rental income
Related person transactions
Revenues		$ 13	$ 78	74	$ 148
AlerisLife Inc
Related person transactions
Equity securities investment (in shares) | shares	10,691,658					10,691,658
Related Party | AlerisLife Inc
Related person transactions
Investment owned, percentage of total shares outstanding						31.90%
Related Party | Reit Management And Research L L C
Related person transactions
Related party transaction, closing cost				$ 6,040
Number of management agreements | agreement		2		2
AlerisLife Inc | AlerisLife Inc
Related person transactions
Noncontrolling interest, ownership percentage by parent						6.10%

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