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Investment Activity (2021 Asset Dispositions) (Details) $ in Thousands	1 Months Ended		3 Months Ended				12 Months Ended
	Sep. 30, 2021 USD ($) property	Aug. 31, 2021 USD ($) property	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($) property	Jun. 30, 2021 USD ($) facility property	Sep. 30, 2020 USD ($)	Dec. 31, 2022 USD ($) property facility	Dec. 31, 2021 USD ($) numberOfProperty	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	May 31, 2022 property	Apr. 01, 2022 property
Real Estate [Line Items]
Properties | property							160
Total							$ 159,625
Gains on sales of real estate, net							28,342	$ 32,498	$ 21,316
Lease Income							(217,700)	(271,049)	(307,208)
Impairment of property			$ (5,895)				(21,531)		(6,400)	$ 0
Asset impairment charges								51,800
Asset Held For Sale In 2022
Real Estate [Line Items]
Lease Income							(2,100)	(5,600)	(7,600)
Asset Held For Sale In 2021
Real Estate [Line Items]
Lease Income								$ (5,400)	(8,000)
Real Estate Investments
Real Estate [Line Items]
Impairment of long-lived assets							$ 51,600
Real estate properties, impaired, sold or classified as held for sale							19	10
Holiday Acquisition Holdings
Real Estate [Line Items]
Asset disposition transaction cost		$ (900)
Holiday Arbor Glenn
Real Estate [Line Items]
Asset disposition transaction cost	$ (100)
Disposal Group, Disposed of by Sale, Not Discontinued Operations
Real Estate [Line Items]
Gains on sales of real estate, net			32,468
Straight line rent adjustments			$ 2,354
Bickford Senior Living
Real Estate [Line Items]
Properties							36				3
Proceeds from sale of real estate					$ 39,900
Total							$ 28,900
Gains on sales of real estate, net					$ 3,568
Lease Income							(27,600)	$ (34,599)	(49,451)
Impairment of property				$ 0
Bickford Senior Living | Negotiations to sale
Real Estate [Line Items]
Properties | property	6			6	6
Bickford Senior Living | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Real Estate [Line Items]
Properties | property					6
Proceeds from sale of real estate					$ 52,900		52,900
Total					13,000
Property, plant and equipment, net					34,500
Straight line rent adjustments					$ 1,871		$ (1,900)
Lease Income								(1,600)	(5,600)
Bickford Senior Living | Lease Abatement for 2020 | Lease Abatement
Real Estate [Line Items]
Operating lease, variable lease income, concessions.						$ 2,100
Bickford Senior Living | Asset Held For Sale In 2022
Real Estate [Line Items]
Properties | property							3
Holiday Acquisition Holdings
Real Estate [Line Items]
Properties | facility					17
Proceeds from sale of real estate		115,000
Gains on sales of real estate, net		$ 1,900		$ 1,882
Lease Income									(40,705)
Impairment of property				$ 0
Holiday Acquisition Holdings | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Real Estate [Line Items]
Properties | property	8	8		8
Property, plant and equipment, net		$ 113,600
Straight line rent adjustments				$ (1,360)
Lease Income								(5,900)	(10,000)
Holiday Acquisition Holdings | Asset Held For Sale In 2022
Real Estate [Line Items]
Properties | property												1
Holiday Arbor Glenn
Real Estate [Line Items]
Proceeds from sale of real estate	$ 5,800
Gains on sales of real estate, net				0
Impairment of property	$ (4,600)			$ (4,641)
Holiday Arbor Glenn | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Real Estate [Line Items]
Properties | property	1			1
Property, plant and equipment, net	$ 10,400			$ 10,400
Straight line rent adjustments				$ (81)
Lease Income								$ (400)	$ (600)

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