Real Estate Investments - Property Sales (Details)		3 Months Ended		6 Months Ended
	Jul. 29, 2021 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) property item	Jun. 30, 2020 USD ($) item property	Dec. 31, 2020 USD ($)
Disposals and other
Carrying value		$ 1,053,072,000		$ 1,053,072,000		$ 1,102,358,000
Net (Loss) gain		5,463,000	$ 189,000	$ 4,690,000	$ 44,043,000
Properties sold
Disposals and other
Number of properties sold | property				5	21
Number of beds or units in property sold | item				303	2,411
Sales price				$ 37,900,000	$ 74,800,000
Carrying value		31,999,000	29,084,000	31,999,000	29,084,000
Net (Loss) gain				4,690,000	44,043,000
Net gain				$ 159,000	102,000
Holdback amount			838,000		$ 838,000
Properties sold | SNF | Arizona
Disposals and other
Number of properties sold | property					1
Number of beds or units in property sold | item					194
Sales price					$ 12,550,000
Carrying value			2,229,000		2,229,000
Net (Loss) gain					$ 10,292,000
Properties sold | SNF | Colorado
Disposals and other
Number of properties sold | property					3
Number of beds or units in property sold | item					275
Sales price					$ 15,000,000
Carrying value			4,271,000		4,271,000
Net (Loss) gain					$ 10,364,000
Properties sold | SNF | Iowa
Disposals and other
Number of properties sold | property					7
Number of beds or units in property sold | item					544
Sales price					$ 14,500,000
Carrying value			4,886,000		4,886,000
Net (Loss) gain					9,005,000
Holdback amount						$ 150,000
Realizable holdback amount					$ 471,000
Properties sold | SNF | Kansas
Disposals and other
Number of properties sold | property					3
Number of beds or units in property sold | item					250
Sales price					$ 9,750,000
Carrying value			7,438,000		7,438,000
Net (Loss) gain					$ 1,993,000
Properties sold | SNF | Texas
Disposals and other
Number of properties sold | property					7
Number of beds or units in property sold | item					1,148
Sales price					$ 23,000,000
Carrying value			$ 10,260,000		10,260,000
Net (Loss) gain					$ 12,287,000
Properties sold | ALF | Florida
Disposals and other
Number of properties sold | property				1
Sales price				$ 2,000,000
Carrying value		2,625,000		2,625,000
Net (Loss) gain				$ (858,000)
Properties sold | ALF | Nebraska
Disposals and other
Number of properties sold | property				1
Number of beds or units in property sold | item				40
Sales price				$ 900,000
Carrying value		1,079,000		1,079,000
Net (Loss) gain				$ (205,000)
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		28,295,000
Net (Loss) gain				$ 5,594,000
Subsequent Event | SNF | Washington
Disposals and other
Proceeds from sale of real estate	$ 7,200,000
Amount of real estate property sold	7,700,000
Subsequent Event | Properties sold | SNF | Washington
Disposals and other
Proceeds from sale of real estate	7,200,000
Amount of real estate property sold	7,700,000
Gain on sale of real estate	$ 2,600,000