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Real Estate Properties - Narrative (Details) $ in Thousands		1 Months Ended		3 Months Ended			6 Months Ended
	Aug. 03, 2020 USD ($) property	Aug. 06, 2020 USD ($) building	Jan. 31, 2020 USD ($)	Jun. 30, 2020 USD ($) state	Mar. 31, 2020 USD ($) building	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) state building	Jun. 30, 2019 USD ($)	Jun. 30, 2020 building	Jun. 30, 2020	Jun. 30, 2020 property
Real Estate Properties
Number of real estate properties | property											412
Number of states in which properties are located | state				38			38
Impairment of assets | $				$ 31,175		$ 2,213	$ 42,409	$ 8,419
Held-for-sale
Real Estate Properties
Number of real estate properties held for sale									21		21
Impairment of assets | $					$ 3,071		31,167
Held-for-sale | Medical Office Buildings
Real Estate Properties
Number of real estate properties | building					7
Number of real estate properties held for sale | building									3
Impairment of assets | $							415
Held-for-sale | Senior Living Communities
Real Estate Properties
Number of real estate properties | building					2
Number of real estate properties held for sale | building									15
Impairment of assets | $							$ 30,752
Disposed of by Sale, Not Discontinued Operations
Real Estate Properties
Number of real estate properties sold | building							12
Aggregate sale price | $							$ 68,154
Impairment of assets | $							$ 8,171
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
Tempe, AZ | Land Parcel
Real Estate Properties
Aggregate purchase price | $			$ 2,600
Subsequent Event
Real Estate Properties
Aggregate sale price | $	$ 231,725
Number of properties under agreement to sell | property	24
Subsequent Event | Held-for-sale
Real Estate Properties
Aggregate sale price | $		$ 5,197
Subsequent Event | Held-for-sale | Medical Office Buildings
Real Estate Properties
Number of real estate properties held for sale | building		3
Number of real estate properties sold | building		2
Subsequent Event | Held-for-sale | Senior Living Communities
Real Estate Properties
Number of real estate properties held for sale | building		15
Number of real estate properties sold | building		2

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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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- Definition

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

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- Definition

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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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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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The number of real estate properties owned as of the balance sheet date.

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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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