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Summary of Significant Accounting Policies - Investments (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) property	Dec. 31, 2022 USD ($)	Feb. 28, 2023 $ / shares	Jun. 30, 2022	Dec. 31, 2021	Mar. 31, 2017
Investment in available for sale securities
Number of medical office and life science properties | property	10
AlerisLife Inc
Investment in available for sale securities
Investment in equity securities acquisition, share price (in dollars per share) | $ / shares			$ 1.31
Corporate Joint Venture
Investment in available for sale securities
Principal amount of debt	$ 1,076,625,000
AlerisLife Inc | Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Carrying Amount
Investment in available for sale securities
Investments in Five Star	0	$ 5,880,000
Realized gain	$ 8,126,000
Unrealized loss		$ 25,660,000
Seaport Innovation LLC | Corporate Joint Venture
Investment in available for sale securities
Equity method investment ownership percentage	10.00%			20.00%	20.00%	55.00%
Principal amount of debt	$ 620,000,000
LSMD Fund REIT LLC | Corporate Joint Venture
Investment in available for sale securities
Equity method investment ownership percentage	20.00%
Principal amount of debt	$ 456,625,000

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