Real Estate Investments - Properties Sales (Details)	3 Months Ended			12 Months Ended
	Dec. 31, 2023 USD ($)	Jun. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($) property item	Dec. 31, 2022 USD ($) item property	Dec. 31, 2021 USD ($) property item
Disposals and other
Carrying value	$ 987,965,000			$ 987,965,000	$ 1,019,218,000
Net gain (loss)				$ 37,296,000	37,830,000	$ 7,462,000
ALF | Florida
Disposals and other
Sales price		$ 4,850,000
Net gain (loss)		$ 64,000
ALF | Kentucky
Disposals and other
Sales price			$ 11,000,000
Net gain (loss)			$ 57,000
ALF | Mississippi
Disposals and other
Sales price	1,650,000
Net gain (loss)	(219,000)
ALF | Virginia
Disposals and other
Lease termination fee payable					$ 1,181,000
Properties sold
Disposals and other
Number of properties sold | property				19	5	6
Number of beds or units in property sold | item				1,059	427	426
Sales price				$ 82,821,000	$ 74,345,000	$ 45,600,000
Carrying value	42,729,000			42,729,000	35,924,000	36,513,000
Net gain (loss)				$ 37,296,000	37,830,000	7,462,000
Net Gain (Loss)					$ 214,000	$ 363,000
Properties sold | ALF | Florida
Disposals and other
Number of properties sold | property				5		1
Number of beds or units in property sold | item				246
Sales price				$ 23,600,000		$ 2,000,000
Carrying value	9,084,000			9,084,000		2,626,000
Net Gain (Loss)				$ 13,327,000		$ (858,000)
Properties sold | ALF | Mississippi
Disposals and other
Number of properties sold | property				1
Number of beds or units in property sold | item				67
Sales price				$ 1,650,000
Carrying value	1,639,000			1,639,000
Net Gain (Loss)				$ (220,000)
Properties sold | ALF | New Jersey
Disposals and other
Number of properties sold | property				1
Number of beds or units in property sold | item				39
Sales price				$ 2,000,000
Carrying value	1,552,000			1,552,000
Net Gain (Loss)				$ 266,000
Properties sold | ALF | Nebraska
Disposals and other
Number of properties sold | property				3		1
Number of beds or units in property sold | item				117		40
Sales price				$ 2,984,000		$ 900,000
Carrying value	2,934,000			$ 2,934,000		1,079,000
Net Gain (Loss)						$ (200,000)
Properties sold | ALF | Oklahoma
Disposals and other
Number of properties sold | property				1
Number of beds or units in property sold | item				37
Sales price				$ 800,000
Carrying value	777,000			777,000
Net Gain (Loss)				$ 11,000
Properties sold | ALF | Pennsylvania
Disposals and other
Number of properties sold | property				2
Number of beds or units in property sold | item				130
Sales price				$ 11,128,000
Carrying value	6,054,000			6,054,000
Net Gain (Loss)				$ 4,860,000
Properties sold | ALF | California
Disposals and other
Number of properties sold | property				1	2
Number of beds or units in property sold | item				60	232
Sales price				$ 11,000,000	$ 43,715,000
Carrying value	10,720,000			10,720,000	17,832,000
Net Gain (Loss)				$ 57,000	$ 25,867,000
Properties sold | ALF | Wisconsin
Disposals and other
Number of properties sold | property						3
Number of beds or units in property sold | item						263
Sales price						$ 35,000,000
Carrying value						28,295,000
Net Gain (Loss)						$ 5,595,000
Properties sold | SNF | New Mexico
Disposals and other
Number of properties sold | property				2
Number of beds or units in property sold | item				235
Sales price				$ 21,250,000
Carrying value	5,523,000			5,523,000
Net Gain (Loss)				$ 15,287,000
Properties sold | SNF | South Carolina
Disposals and other
Number of properties sold | property				3
Number of beds or units in property sold | item				128
Sales price				$ 8,409,000
Carrying value	$ 4,446,000			4,446,000
Net Gain (Loss)				$ 3,708,000
Properties sold | SNF | California
Disposals and other
Number of properties sold | property					1
Number of beds or units in property sold | item					121
Sales price					$ 13,250,000
Carrying value					1,846,000
Net Gain (Loss)					$ 10,846,000
Properties sold | SNF | Texas
Disposals and other
Number of properties sold | property					1
Sales price					$ 485,000
Carrying value					697,000
Net Gain (Loss)					$ (441,000)
Properties sold | SNF | Virginia
Disposals and other
Number of properties sold | property					1
Number of beds or units in property sold | item					74
Sales price					$ 16,895,000
Carrying value					15,549,000
Net Gain (Loss)					$ 1,344,000
Properties sold | SNF | Washington
Disposals and other
Number of properties sold | property						1
Number of beds or units in property sold | item						123
Sales price						$ 7,700,000
Carrying value						4,513,000
Net Gain (Loss)						$ 2,562,000