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Real Estate Investments - Narrative (Details) $ in Thousands	1 Months Ended				6 Months Ended
	Jul. 31, 2022 USD ($) ft² trustee	Jun. 30, 2022 USD ($) ft² jointVenture property state	Jan. 31, 2022 USD ($) investor property	Dec. 31, 2021 USD ($)	Jun. 30, 2022 USD ($) ft² jointVenture property state	Jun. 28, 2022	Dec. 30, 2021
Real Estate Properties
Number of properties (property) | property		378			378
Number of states in which properties are located | state		36			36
Number of states | state					5
Subsequent Event | Life Science Building Located In California
Real Estate Properties
Number of properties (property) | trustee	1
Area of real estate property | ft²	89,000
Purchase price	$ 82,000
Senior Living Communities | Skilled nursing bed license
Real Estate Properties
Gain (loss) on sales of beds		$ (1,226)	$ 327,542
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		10.00%			10.00%	20.00%	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%			10.00%
Joint Venture
Real Estate Properties
Number of unconsolidated joint ventures | jointVenture		2			2

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