Debt - Mortgage Debt (Details) $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2023 USD ($) facility property	Dec. 31, 2023 USD ($) facility	Dec. 31, 2022 USD ($) facility property	Dec. 31, 2021 USD ($) property	Feb. 28, 2023 derivative_held	Aug. 31, 2022 derivative_held	Apr. 30, 2022 derivative_held	Apr. 30, 2021 USD ($)
Debt Instrument [Line Items]
Principal balance on debt	$ 6,925,122	$ 6,925,122
Interest rate swap instruments | Designated as Hedging Instrument
Debt Instrument [Line Items]
Number of interest-rate contracts held | derivative_held						2
Interest rate swap instruments | Cash Flow Hedging | Designated as Hedging Instrument
Debt Instrument [Line Items]
Number of interest-rate contracts held | derivative_held					2		2
Outpatient Medical
Debt Instrument [Line Items]
Property count | property			3	4
Outpatient Medical | Mortgage Debt
Debt Instrument [Line Items]
Property count | facility	13	13
Face amount	$ 142,000	$ 142,000						$ 142,000
CCRC | Mortgage Debt
Debt Instrument [Line Items]
Face amount	$ 85,000	85,000
Number of loans | property	1
Mortgage Debt
Debt Instrument [Line Items]
Principal balance on debt	$ 255,122	255,122	$ 345,000
Debt instrument, collateral, healthcare facilities carrying value	$ 587,000	587,000	793,000
Debt instrument, periodic payment, principal		$ 90,000	$ 5,000	$ 9,000
Mortgage Debt | Outpatient Medical
Debt Instrument [Line Items]
Property count | facility	15	15	15
Mortgage Debt | CCRC
Debt Instrument [Line Items]
Property count | facility	2	2	3
Debt instrument, periodic payment, principal		$ 90,000