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Equity Method Investment, Partner's Ownership Percentage

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Gain (Loss) On Consolidation

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Gain On Consolidation, Tax

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Represents number of assets sold or transited per definitive agreements.

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Number Of Properties Acquired

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Payments To Acquire Outstanding Equity Interests

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount of gain (loss) from deconsolidation of subsidiary and derecognition of group of assets constituting transfer of business or nonprofit activity, excluding conveyance of oil and gas mineral rights and transfer of good or service in contract with customer.

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- Definition

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 net gain (loss) resulting from sales and other disposals of real estate owned for investment purposes.

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Fair value portion of investments in an entity not consolidated. Includes, but is not limited to, investments in an entity that is affiliated with the reporting entity by means of direct or indirect ownership, an entity in which the reporting entity shares control of the entity with another party or group, an entity which the company has significant influence, but does not have control and subsidiaries that are not required to be consolidated and are accounted for using the equity or cost method.

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The cash outflow from the acquisition of a piece of land, anything permanently fixed to it, including buildings, structures on it and so forth; includes real estate intended to generate income for the owner; excludes real estate acquired for use by the owner.

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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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Real Estate Transactions - 2019 Real Estate Investments (Details)		1 Months Ended								3 Months Ended							12 Months Ended
	Jan. 31, 2020 USD ($)	Jan. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) property asset	Jul. 31, 2019 USD ($) property facility	Jun. 30, 2019 USD ($) property	May 31, 2019 USD ($) property	Apr. 30, 2019 USD ($) property	Nov. 30, 2018 USD ($)	Jan. 31, 2017 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) property asset	Dec. 31, 2018 USD ($) property	Dec. 31, 2017 USD ($)
Real Estate [Line Items]
Payments to acquire real estate																		$ 21,000,000
Gain (loss) on sales of real estate, net										$ 11,000,000	$ 0	$ 11,000,000	$ 8,000,000	$ 95,000,000	$ 25,000,000		$ 22,900,000	925,985,000	$ 356,641,000
Long-term debt, gross			$ 6,307,244,000							$ 6,307,244,000							6,307,244,000
Gain on consolidation								$ 50,000,000									168,023,000	$ 9,154,000	0
Life science
Real Estate [Line Items]
Gain (loss) on sales of real estate, net									$ 45,000,000
SHOP
Real Estate [Line Items]
Gain (loss) on sales of real estate, net																$ 21,000,000
Senior housing
Real Estate [Line Items]
Number of properties acquired \| property					1
Payments to acquire outstanding equity interests					$ 24,000,000
Investment ownership percentage					100.00%							100.00%
Gain on consolidation					$ 12,000,000
Gain on consolidation, tax					1,000,000
Life Science JVs
Real Estate [Line Items]
Payments to acquire real estate					$ 245,000,000
Number of properties acquired \| property					2
Medical office
Real Estate [Line Items]
Gain (loss) on sales of real estate, net																			$ 41,000,000
Life Science facility \| Life science
Real Estate [Line Items]
Payments to acquire real estate													71,000,000
Land \| Life science
Real Estate [Line Items]
Payments to acquire real estate													$ 27,000,000
Senior housing \| Senior housing
Real Estate [Line Items]
Payments to acquire real estate				$ 284,000,000		$ 113,000,000	$ 445,000,000
Number of properties acquired \| property				5		3	9
Mortgage debt
Real Estate [Line Items]
Long-term debt, gross				$ 112,000,000		$ 50,000,000
Boston \| Life Science facility \| Life science
Real Estate [Line Items]
Payments to acquire real estate				$ 228,000,000
Number of properties acquired \| facility				4
Cambridge, Massachusetts \| Life Science facility \| Life science
Real Estate [Line Items]
Payments to acquire real estate			$ 333,000,000
Number of properties acquired \| asset			1
Kansas \| Medical office
Real Estate [Line Items]
Payments to acquire real estate																	$ 15,000,000
Number of properties acquired \| asset																	1
Texas \| Medical office
Real Estate [Line Items]
Payments to acquire real estate																	$ 9,000,000
Number of properties acquired \| property																	1
San Diego \| Life science
Real Estate [Line Items]
Number of properties acquired \| property																	1
San Diego \| Life Science facility \| Life science
Real Estate [Line Items]
Payments to acquire real estate																	$ 16,000,000
Assets leased to others
Real Estate [Line Items]
Number of assets sold or transitioned \| property																		37
Assets leased to others \| SHOP
Real Estate [Line Items]
Number of assets sold or transitioned \| property																		20
SHOP JV
Real Estate [Line Items]
Investment ownership percentage			54.00%							54.00%							54.00%
Purchase cost			$ 367,000,000							$ 367,000,000							$ 367,000,000
Partner's ownership percentage			46.50%							46.50%							46.50%
SHOP JV \| SHOP
Real Estate [Line Items]
Investment ownership percentage			53.50%							53.50%							53.50%
Purchase cost			$ 790,000,000							$ 790,000,000							$ 790,000,000
SHOP JV \| Assets leased to others \| SHOP
Real Estate [Line Items]
Number of assets sold or transitioned \| property			19
SHOP JV
Real Estate [Line Items]
Gain (loss) on deconsolidation			$ 161,000,000
Subsequent Event \| Massachusetts \| Life science
Real Estate [Line Items]
Payments to acquire real estate		$ 320,000,000
Nonrefundable deposit	$ 20,000,000