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Real Estate Properties - Narrative (Details) $ in Thousands		1 Months Ended		3 Months Ended			9 Months Ended
	Nov. 02, 2020 USD ($) property	Nov. 05, 2020 USD ($) trustee	Jan. 31, 2020 USD ($)	Sep. 30, 2020 USD ($) property	Mar. 31, 2020 USD ($) building	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) building property	Sep. 30, 2019 USD ($)	Sep. 30, 2020 state	Sep. 30, 2020	Sep. 30, 2020 building
Real Estate Properties
Number of real estate properties | property				407			407
Number of states in which properties are located | state									37
Number of real estate properties scheduled for closure | property				10			10
Impairment of assets				$ 64,202		$ 33,099	$ 106,611	$ 41,518
Senior Living Community, Schedule For Closure Or Sale
Real Estate Properties
Number of real estate properties scheduled for closure | building											10
Held-for-sale
Real Estate Properties
Number of real estate properties held for sale				22			22				22
Aggregate sale price							$ 80,601
Impairment of assets							34,880
Held-for-sale | Medical Office Buildings
Real Estate Properties
Number of real estate properties | building					6
Number of real estate properties held for sale | building											5
Impairment of assets					$ 3,071		1,524
Held-for-sale | Senior Living Communities
Real Estate Properties
Number of real estate properties | building					1
Number of real estate properties held for sale | building											14
Impairment of assets							33,356
Held-for-sale | Triple Net Leased Senior Living Communities
Real Estate Properties
Number of real estate properties held for sale | building											3
Impairment of assets							0
Held-for-sale | Senior Living Community, Schedule For Closure Or Sale
Real Estate Properties
Number of real estate properties | building											9
Impairment of assets				$ 59,847			$ 59,847
Disposed of by Sale, Not Discontinued Operations
Real Estate Properties
Number of real estate properties sold | building							17
Impairment of assets							$ 8,813
Joint Venture
Real Estate Properties
Ownership percentage										55.00%
Joint Venture | Life Science Building
Real Estate Properties
Number of properties included in joint venture | property				1			1
Tempe, AZ | Land Parcel
Real Estate Properties
Aggregate purchase price			$ 2,600
Subsequent Event
Real Estate Properties
Aggregate sale price	$ 167,392
Number of properties under agreement to sell | property	21
Subsequent Event | Held-for-sale
Real Estate Properties
Aggregate sale price		$ 49,000
Subsequent Event | Held-for-sale | Senior Living Communities
Real Estate Properties
Number of real estate properties sold | trustee		1
Subsequent Event | Held-for-sale | Triple Net Leased Senior Living Communities
Real Estate Properties
Number of real estate properties sold | trustee		3

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- Definition

Number Of Properties Included In Joint Venture

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The number of real estate properties owned by the entity, which are classified as held for sale as of the balance sheet date.

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Number of Real Estate Properties Sold

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Number of Real Estate Properties Under Agreement

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- Definition

Represents the aggregate purchase price excluding acquisition costs of real estate properties acquired or agreed to be acquired by the entity.

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This element represents the aggregate sales price excluding closing costs, of real estate properties sold by the entity.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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-Topic 230
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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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