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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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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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Cash outflow related to amounts given in advance to show or confirm an intention to complete an acquisition of land, buildings, other structures, or any item classified as real estate.

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The cash outflow from the acquisition of real estate intended to generate income for the owner; excludes land acquired for use by the owner.

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The cash outflow associated with the purchase of real estate held-for-investment and real estate joint ventures.

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Real Estate Transactions - Real Estate Investments (Details)	1 Months Ended											9 Months Ended		12 Months Ended
	Oct. 31, 2021 USD ($) property	Sep. 30, 2021 USD ($) property	Jul. 31, 2021 USD ($) property	Jun. 30, 2021 USD ($) property	Apr. 30, 2021 USD ($) property	Feb. 28, 2021 USD ($) property	Dec. 31, 2020 USD ($) property	Nov. 30, 2020 USD ($) property	Oct. 31, 2020 USD ($) a property	Jul. 31, 2020 USD ($) property	Apr. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) property	Sep. 30, 2020 USD ($)	Dec. 31, 2020 property
Real Estate [Line Items]
Number of properties acquired \| property												0
Loss from change of control												$ (1,042,000)	$ (173,222,000)
Debt assumed		$ 5,578,596,000										$ 5,578,596,000
Life science joint ventures
Real Estate [Line Items]
Investment ownership percentage		49.00%										49.00%
Waldwick
Real Estate [Line Items]
Number of properties acquired \| property									1
Investment ownership percentage									100.00%
Additional ownership percentage acquired									15.00%
Payments to acquire real estate joint ventures									$ 4,000,000
Gain from change of control, net									$ 6,000,000
Mbk Jv
Real Estate [Line Items]
Number of properties acquired \| property								1
Proceeds from divestiture of interest in joint venture								$ 11,000,000
Loss from change of control								16,000,000
Debt assumed								36,000,000
CALIFORNIA
Real Estate [Line Items]
Area of land (in acres) \| a									12
Payments to acquire land									$ 128,000,000
Number of adjacent sites currently held \| property									2
Payments for deposits on real estate acquisitions								$ 10,000,000
CALIFORNIA \| First Tranche
Real Estate [Line Items]
Payments to acquire land					$ 61,000,000
CALIFORNIA \| Second Tranche
Real Estate [Line Items]
Payments to acquire land		$ 24,000,000
CALIFORNIA \| Third Tranche \| Subsequent Event
Real Estate [Line Items]
Payments to acquire land	$ 43,000,000
Massachusetts
Real Estate [Line Items]
Payments to acquire real estate							$ 54,000,000
Massachusetts \| Life science joint ventures
Real Estate [Line Items]
Investment ownership percentage							49.00%							49.00%
Medical office
Real Estate [Line Items]
Number of properties acquired \| property														7
Medical office \| Subsequent Event
Real Estate [Line Items]
Number of properties acquired \| property	2
Medical office \| Mortgage Debt
Real Estate [Line Items]
Amount					$ 142,000,000
Medical office \| TENNESSEE
Real Estate [Line Items]
Number of properties acquired \| property						1
Payments to acquire real estate						$ 13,000,000
Medical office \| COLORADO
Real Estate [Line Items]
Number of properties acquired \| property					1
Payments to acquire real estate					$ 38,000,000
Medical office \| UNITED STATES
Real Estate [Line Items]
Number of properties acquired \| property					14
Payments to acquire real estate					$ 371,000,000
Medical office \| FLORIDA
Real Estate [Line Items]
Number of properties acquired \| property				1
Payments to acquire real estate				$ 16,000,000
Medical office \| Kansas
Real Estate [Line Items]
Number of properties acquired \| property			1
Payments to acquire real estate			$ 50,000,000
Medical office \| NEW JERSEY
Real Estate [Line Items]
Number of properties acquired \| property			3
Payments to acquire real estate			$ 155,000,000
Medical office \| Texas
Real Estate [Line Items]
Number of properties acquired \| property		2					1
Payments to acquire real estate		$ 60,000,000					$ 34,000,000
Medical office \| Massachusetts \| Subsequent Event
Real Estate [Line Items]
Payments to acquire real estate	$ 80,000,000
Medical office \| Washington \| Subsequent Event
Real Estate [Line Items]
Number of properties acquired \| property	1
Payments to acquire real estate	$ 43,000,000
Medical office \| LOUISIANA \| Subsequent Event
Real Estate [Line Items]
Number of properties acquired \| property	1
Payments to acquire real estate	$ 34,000,000
Medical office \| ARIZONA
Real Estate [Line Items]
Number of properties acquired \| property										1
Payments to acquire real estate										$ 27,000,000
Medical office \| Indiana, Missouri, Illinois
Real Estate [Line Items]
Number of properties acquired \| property									7
Payments to acquire real estate									$ 169,000,000
Life science
Real Estate [Line Items]
Number of properties acquired \| property														3
Life science \| CALIFORNIA \| Subsequent Event
Real Estate [Line Items]
Payments to acquire real estate	20,000,000
Life science \| Massachusetts
Real Estate [Line Items]
Number of properties acquired \| property		3					3
Payments to acquire real estate		$ 180,000,000					$ 610,000,000				$ 320,000,000
Life science \| Massachusetts \| Subsequent Event
Real Estate [Line Items]
Payments to acquire real estate	73,000,000
Life science \| Massachusetts \| 25 Spinelli \| Subsequent Event
Real Estate [Line Items]
Payments to acquire real estate	34,000,000
Life science \| Massachusetts \| 68 Moulton \| Subsequent Event
Real Estate [Line Items]
Payments to acquire real estate	18,000,000
Life science \| Massachusetts \| Mooney Street Parcels \| Subsequent Event
Real Estate [Line Items]
Payments to acquire real estate	$ 123,000,000
Land parcel \| Mbk Jv
Real Estate [Line Items]
Number of properties acquired \| property								1