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Real Estate Transactions - 2019 Real Estate Investments (Details) $ in Thousands	1 Months Ended					3 Months Ended	6 Months Ended
	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 ($) property	Mar. 31, 2019 USD ($)	Jun. 30, 2019 USD ($) property	Jun. 30, 2018 USD ($)
Real Estate [Line Items]
Payments to acquire real estate								$ 21,000
Long-term debt		$ 6,234,984					$ 6,234,984
Gain (loss) on consolidation					$ 50,000		$ 11,501	$ (41,017)
Life science \| Life science facility
Real Estate [Line Items]
Payments to acquire real estate						$ 71,000
Life science \| Land
Real Estate [Line Items]
Payments to acquire real estate						$ 27,000
Senior Housing
Real Estate [Line Items]
Payments to acquire outstanding equity interests		$ 24,000
Investment ownership percentage		100.00%					100.00%
Gain (loss) on consolidation		$ 12,000
Gain on consolidation, tax		1,000
Senior Housing \| Senior Housing
Real Estate [Line Items]
Payments to acquire real estate			$ 113,000	$ 445,000
Number of properties acquired (in properties) \| property			3	9
Subsequent Event \| Senior Housing \| Senior Housing
Real Estate [Line Items]
Payments to acquire real estate	$ 284,000
Number of properties acquired (in properties) \| property	5
Life science joint ventures
Real Estate [Line Items]
Payments to acquire real estate		$ 245,000			$ 92,000
Number of properties acquired (in properties) \| property		2			4
Investment ownership percentage					100.00%
Medical office
Real Estate [Line Items]
Payments to acquire real estate							$ 15,000
Number of properties acquired (in properties) \| property							1
Mortgage Debt
Real Estate [Line Items]
Long-term debt		$ 154,980	$ 50,000				$ 154,980
Mortgage Debt \| Subsequent Event
Real Estate [Line Items]
Long-term debt	$ 112,000
San Diego \| Subsequent Event \| Life science \| Life science facility
Real Estate [Line Items]
Payments to acquire real estate	16,000
Boston \| Subsequent Event \| Life science \| Life science facility
Real Estate [Line Items]
Payments to acquire real estate	$ 228,000
Number of properties acquired (in properties) \| facility	4