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Debt - Mortgage Debt (Details) $ in Thousands	3 Months Ended		6 Months Ended
Debt - Mortgage Debt (Details) $ in Thousands	Jun. 30, 2023 USD ($) facility	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) facility	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) property facility	Aug. 31, 2022 derivative_held	Apr. 30, 2022 derivative_held
Debt Instrument
Principal balance on debt	$ 6,621,593		$ 6,621,593
Interest rate swap instruments \| Designated as Hedging Instrument
Debt Instrument
Number of interest-rate contracts held \| derivative_held						2
Interest rate swap instruments \| Cash Flow Hedging \| Designated as Hedging Instrument
Debt Instrument
Number of interest-rate contracts held \| derivative_held							2
Outpatient Medical Buildings
Debt Instrument
Property count \| property					3
Outpatient Medical Buildings \| Mortgage Debt
Debt Instrument
Property count \| facility	13		13
Aggregate principal amount	$ 142,000		$ 142,000
Mortgage Debt
Debt Instrument
Principal balance on debt	342,593		342,593		$ 345,000
Debt instrument, collateral, healthcare facilities carrying value	778,000		778,000		$ 793,000
Debt instrument, periodic payment	$ 1,000	$ 1,000	$ 3,000	$ 3,000
Mortgage Debt \| Outpatient Medical Buildings
Debt Instrument
Property count \| facility	15		15		15
Mortgage Debt \| CCRC
Debt Instrument
Property count \| facility	3		3		3