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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Amount of gain (loss) on sale or disposal of assets, including but not limited to property plant and equipment, intangible assets and equity in securities of subsidiaries or equity method investee.

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The number of real estate properties owned as of the balance sheet date.

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Cash received for the sale of real estate that is not part of an investing activity during the current period.

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Cash received from the sale of real estate that is held for investment, that is, it is part of an investing activity during the period.

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Equity Method Investment, Ownership Percentage By Other Owners

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Vacant Land Parcels Sold

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Dispositions and Impairments - 2020 Dispositions Activity (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) property senior_housing	Dec. 31, 2019 USD ($) property senior_housing	Dec. 31, 2018 USD ($)	Oct. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on real estate dispositions \| $	$ 262,218	$ 26,022	$ 46,247
Number of real estate properties \| property	1,200
Proceeds from real estate disposals \| $	$ 1,044,357	147,855	$ 353,792
The Fund [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on real estate dispositions \| $	225,100
Proceeds from real estate disposals \| $	$ 620,000
Ownership interests in properties accounted for under the equity method	21.00%
Research and Innovation Center \| GIC JV Project [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on real estate dispositions \| $	$ 13,700
Ownership interests in properties accounted for under the equity method				50.00%
Research and Innovation Center \| GIC JV Project [Member] \| R&I JV [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Equity Method Investment, Ownership Percentage By Other Owners				45.00%
Triple-net leased properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties \| property	366
Dispositions [Member] \| The Fund [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties \| property	6
Dispositions [Member] \| The Fund [Member] \| Same Campus [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties \| property	2
2019 Dispositions [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on real estate dispositions \| $		26,000
Proceeds from sale of real estate \| $		$ 147,500
Vacant Land Parcels Sold \| senior_housing		1
2019 Dispositions [Member] \| Medical Office Buildings
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties \| property		8
2019 Dispositions [Member] \| Triple-net leased properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties \| property		10
2020 Dispositions [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on real estate dispositions \| $	$ 23,400
Proceeds from sale of real estate \| $	$ 249,600
Vacant Land Parcels Sold \| senior_housing	1
2020 Dispositions [Member] \| Medical Office Buildings
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties \| property	4
2020 Dispositions [Member] \| Senior living operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties \| property	4
2020 Dispositions [Member] \| Triple-net leased properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties \| property	22