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Real Estate Investments - Narrative (Details) $ in Thousands	1 Months Ended			3 Months Ended	9 Months Ended
	Jun. 30, 2022 USD ($)	Jan. 31, 2022 USD ($) property investor	Dec. 31, 2021 USD ($)	Sep. 30, 2022 USD ($) ft² jointVenture property state	Sep. 30, 2022 USD ($) ft² jointVenture property state	Jun. 28, 2022	Dec. 30, 2021	Mar. 31, 2017
Real Estate Properties
Number of properties (property) | property				379	379
Number of states in which properties are located | state				36	36
Number of states | state					5
Senior Living Communities
Real Estate Properties
Insurance deductibles and other costs associated with hurricane damage				$ 4,112	$ 4,112
Senior Living Communities | Skilled nursing bed license
Real Estate Properties
Gain (loss) on sales of beds	$ (1,226)	$ 322,468
Seaport Innovation LLC
Real Estate Properties
Aggregate principal amount of mortgage debt			$ 620,000
Real estate property fair value				$ 1,700,000	$ 1,700,000
Corporate Joint Venture
Real Estate Properties
Number of properties (property) | property				11	11
Area of real estate property | ft²				2,203,242	2,203,242
Aggregate principal amount of mortgage debt		456,600
Real estate property fair value		702,500
Corporate Joint Venture | Medical Office Building and Life Science Building
Real Estate Properties
Proceeds from sale of interest in joint venture, net		$ 653,300
Number of third party institutional investors | investor		2
Number of properties included in joint venture agreement | property		10
Corporate Joint Venture | Diversified Healthcare Trusts | Medical Office Building and Life Science Building
Real Estate Properties
Equity method investment ownership percentage		20.00%
Corporate Joint Venture | Diversified Healthcare Trusts | Unrelated Investor One | Medical Office Building and Life Science Building
Real Estate Properties
Equity method investment ownership percentage		41.00%
Corporate Joint Venture | Diversified Healthcare Trusts | Unrelated Investor Two | Medical Office Building and Life Science Building
Real Estate Properties
Equity method investment ownership percentage		39.00%
Corporate Joint Venture | Seaport Innovation LLC
Real Estate Properties
Number of properties (property) | property				1	1
Area of real estate property | ft²				1,134,479	1,134,479
Additional equity joint venture percentage	10.00%		35.00%
Equity method investment ownership percentage			20.00%	10.00%	10.00%	20.00%	55.00%	55.00%
Proceeds from sale of interest in joint venture, net	$ 108,000		$ 378,000
Proceeds from sale of other assets	$ 108,956
Corporate Joint Venture | Seaport Innovation LLC | Medical Office Building and Life Science Building
Real Estate Properties
Equity method investment ownership percentage	10.00%
Joint Venture
Real Estate Properties
Number of unconsolidated joint ventures | jointVenture				2	2

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