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Real Estate Transactions - 2019 Real Estate Investments (Details) $ in Thousands	1 Months Ended							3 Months Ended	12 Months Ended
	Nov. 30, 2020 USD ($) property	Jul. 31, 2020 property	Dec. 31, 2019 USD ($) property asset	Jul. 31, 2019 USD ($) facility property	Jun. 30, 2019 USD ($) property	May 31, 2019 USD ($) property	Apr. 30, 2019 USD ($) property	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) asset	Dec. 31, 2019 USD ($) property asset
Real Estate [Line Items]
Long-term debt, gross									$ 6,346,370
Sierra Point Towers
Real Estate [Line Items]
Payments to acquire real estate					$ 245,000
Number of properties acquired | property					2
Life Science
Real Estate [Line Items]
Number of properties acquired | asset									3
Senior Housing
Real Estate [Line Items]
Number of properties acquired | property					1
Payments to acquire outstanding equity interests					$ 24,000
Investment ownership percentage					100.00%
Gain on consolidation					$ 12,000
Gain on consolidation, tax					$ 1,000
Medical Office
Real Estate [Line Items]
Number of properties acquired		1							7
Life Science facility | Life Science
Real Estate [Line Items]
Payments to acquire real estate								$ 71,000
Land
Real Estate [Line Items]
Number of properties acquired | property	1
Land | Life Science
Real Estate [Line Items]
Payments to acquire real estate								$ 27,000
Senior Housing
Real Estate [Line Items]
Number of properties acquired | property	1
Senior Housing | Senior Housing
Real Estate [Line Items]
Payments to acquire real estate				$ 284,000		$ 113,000	$ 445,000
Number of properties acquired | property				5		3	9
Mortgage Debt
Real Estate [Line Items]
Long-term debt, gross	$ 36,000		$ 12,000	$ 112,000		$ 50,000			$ 216,780	$ 12,000
Boston | Life Science facility | Life Science
Real Estate [Line Items]
Payments to acquire real estate				$ 228,000
Number of properties acquired | facility				4
Cambridge, Massachusetts | Life Science facility | Life Science
Real Estate [Line Items]
Payments to acquire real estate			$ 333,000
Number of properties acquired | asset			1
Kansas | Medical Office
Real Estate [Line Items]
Payments to acquire real estate										$ 15,000
Number of properties acquired | asset										1
Texas | Medical Office
Real Estate [Line Items]
Payments to acquire real estate										$ 9,000
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
Assets leased to others
Real Estate [Line Items]
Number of assets sold or transitioned | property										37
Assets leased to others | Senior Housing Operating Portfolio
Real Estate [Line Items]
Number of assets sold or transitioned | property										20
SHOP JV
Real Estate [Line Items]
Investment ownership percentage									54.00%
Purchase cost			$ 367,000							$ 367,000
Partner's ownership percentage			46.50%							46.50%
SHOP JV | Other Non-Reporting Segment
Real Estate [Line Items]
Investment ownership percentage			53.50%							53.50%
Purchase cost			$ 790,000							$ 790,000
SHOP JV | Assets leased to others | Other Non-Reporting Segment
Real Estate [Line Items]
Number of assets sold or transitioned | property			19
SHOP JV
Real Estate [Line Items]
Gain (loss) on deconsolidation			$ 161,000

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