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Debt - Senior Unsecured Note and Mortgage Debt (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025 USD ($) facility property	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) facility property obligation	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($) facility	Aug. 31, 2022 derivative_held	Apr. 30, 2022 derivative_held
Debt Instrument
Principal balance on debt	$ 9,175,471		$ 9,175,471
Letter of Credit
Debt Instrument
Number of obligations expiring \| obligation			16
Contractual obligation	$ 16,000		$ 16,000
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	2
Outpatient Medical Buildings \| Secured Debt
Debt Instrument
Property count \| facility	13		13
Aggregate principal amount	$ 142,000		$ 142,000
Outpatient medical \| Secured Debt
Debt Instrument
Property count \| facility	1		1
Debt instrument, periodic payment			$ 4,000
Secured Debt
Debt Instrument
Principal balance on debt	$ 350,471		350,471		$ 356,000
Debt instrument, collateral, healthcare facilities carrying value	758,000		758,000		$ 770,000
Debt instrument, periodic payment	$ 1,000	$ 1,000	$ 6,000	$ 2,000
Secured Debt \| Outpatient Medical Buildings
Debt Instrument
Property count	18		18		19
Secured Debt \| CCRC
Debt Instrument
Property count	2		2		2