Debt - Senior Unsecured Note and Mortgage Debt (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025 USD ($) facility property	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) facility property obligation	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($) facility	Aug. 31, 2022 derivative_held	Apr. 30, 2022 derivative_held
Debt Instrument
Principal balance on debt	$ 9,267,681		$ 9,267,681
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	$ 349,556		349,556		$ 356,000
Debt instrument, collateral, healthcare facilities carrying value	752,000		752,000		$ 770,000
Debt instrument, periodic payment	$ 1,000	$ 1,000	$ 6,000	$ 3,000
Secured Debt | Outpatient Medical Buildings
Debt Instrument
Property count	18		18		19
Secured Debt | CCRC
Debt Instrument
Property count	2		2		2