Mortgage and Other Notes Receivable (Narrative) (Details) $ in Thousands	1 Months Ended					3 Months Ended		12 Months Ended
	Nov. 30, 2022 USD ($) property facility	Jan. 31, 2022 USD ($) property	May 31, 2021 USD ($)	Apr. 30, 2021 USD ($)	Jun. 30, 2019 USD ($) extensionOption bedOrUnitInTheProperty	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($) renewalOption property bedOrUnitInTheProperty	Dec. 31, 2022 USD ($) property	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2022 property	Dec. 31, 2022 facility	Dec. 31, 2022 mortgage	Dec. 31, 2022 bedOrUnitInTheProperty	Dec. 31, 2022 operator	Dec. 31, 2022	Dec. 31, 2022 realEstateInvestment	Dec. 31, 2022 loan	May 31, 2022 property	Apr. 30, 2022 realEstateInvestment	Sep. 30, 2021 property	Apr. 01, 2021 renewalOption	Dec. 31, 2018 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Mortgage and other notes receivable, net								$ 233,141	$ 299,952
Number of health care properties related to mortgage notes receivables											17		17
Financing receivable, allowance for credit loss								15,338	5,210
Interest income and other								(24,698)	(27,666)	$ (25,603)
Total								159,625
Loans an leases receivable, gross								(248,479)
Collection of mortgage and other notes receivable								119,212	67,790	46,612
Interest income and other								24,698
Contingent funding commitment, amount funded								2,700
Properties | property											160
Increase in mortgage note receivable from sale of real estate								0	0	4,000
Number of construction loans | loan																		2
Probability of default, increase, current conditions adjustment																20.00%
Estimated credit losses, current conditions adjustment, combined																44.00%
Mortgage Receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans an leases receivable, gross								(154,576)
Nonperforming Financial Instruments
Financing Receivable, Allowance for Credit Loss [Line Items]
Number of operators/borrowers | operator															1
Interest income and other								(1,400)	(1,900)	(2,000)
Loans an leases receivable, gross								(24,500)
Nonperforming Financial Instruments | Mortgage Receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Mortgage and other notes receivable, net								10,000
Nonperforming Financial Instruments | Mezzanine Loan Receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Mortgage and other notes receivable, net								14,500
Capital Funding Group
Financing Receivable, Allowance for Credit Loss [Line Items]
Number of collateral properties | facility	5
Financing receivable, stated interest rate	7.25%
Number of additional lease renewal options | property	2
Note receivable renewal term	1 year
Payments to acquire receivables	$ 42,500
Montecito Medical Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Mortgage and other notes receivable, net								20,300
Interest income and other								(1,800)	(200)
Total				$ 50,000
Loan term				5 years
Notes receivable, interest rate, master credit agreement																						9.50%
Number of additional lease renewal options | renewalOption																						2
Note receivable renewal term				1 year
Contingent funding commitment, amount funded								8,200
Number of real estate investments | realEstateInvestment																	3			2
Payments for loans								300
Investment interest rate																				7.50%
Deferred interest rate, additional interest rate accrued																				4.50%
Incremental percentage increase in the stated rate of a note receivable																						2.50%
Vizion Health
Financing Receivable, Allowance for Credit Loss [Line Items]
Mortgage and other notes receivable, net								18,800
Total			$ 20,000
Loan term			5 years
Notes receivable, interest rate, master credit agreement			8.50%
Incremental percentage increase in the stated rate of a note receivable			2.50%
Note receivable, payment terms, initial percent of excess operating cash flow			90.00%
Note receivable, payment terms, reduced percent of excess operating cash flow			50.00%
Vizion Health | Loan Balance Threshold Payment Terms Change
Financing Receivable, Allowance for Credit Loss [Line Items]
Total			$ 15,000
Navion Senior Solutions
Financing Receivable, Allowance for Credit Loss [Line Items]
Total			$ 3,600
Number of units in real estate property | bedOrUnitInTheProperty							48
Loan term			10 years
Number of additional lease renewal options | renewalOption							2
Note receivable interest rate			8.00%
Bickford Senior Living
Financing Receivable, Allowance for Credit Loss [Line Items]
Total								28,900
Loans an leases receivable, gross								(32,727)
Properties												36							3
Interest income								1,300	900
Contingent incentive payments								2,000
Encore Senior Living
Financing Receivable, Allowance for Credit Loss [Line Items]
Mortgage and other notes receivable, net								14,200
Total		$ 28,500
Loan term	5 years	4 years
Notes receivable, interest rate, master credit agreement		8.50%
Number of additional lease renewal options | property		2
Note receivable renewal term		1 year
LCS Sagewood
Financing Receivable, Allowance for Credit Loss [Line Items]
Mortgage and other notes receivable, net																							$ 180,000
Notes receivable, number of loans, master credit agreement																							2
Increase (decrease) in notes receivables								61,200
Life-Care Services - Sagewood
Financing Receivable, Allowance for Credit Loss [Line Items]
Collection of mortgage and other notes receivable						$ 111,300
Proceeds repayment fee and accrued interest on receivable						$ 1,100
Interest income and other								5,200	10,200	$ 11,400
Senior Living Communities
Financing Receivable, Allowance for Credit Loss [Line Items]
Number of units in real estate property | bedOrUnitInTheProperty														2,200
Loan term					5 years
Notes receivable, interest rate, master credit agreement					7.25%											8.00%
Number of additional lease renewal options | extensionOption					2
Note receivable renewal term					1 year
Loans an leases receivable, gross								(48,547)
Properties | property											10
Loans and lease receivable, maximum revolving amount								20,000
Revolving note receivable, amount outstanding								15,800	9,600
Purchase option, minimum amount					$ 38,300
Secured By Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Mortgage and other notes receivable, net								164,600	230,900
Not Secured By Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Mortgage and other notes receivable, net								83,900	$ 74,200
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Bickford Senior Living
Financing Receivable, Allowance for Credit Loss [Line Items]
Total							$ 13,000
Note receivable interest rate																10.00%
Properties | property							6
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Bickford Senior Living | Unlikely to be Collected Financing Receivable
Financing Receivable, Allowance for Credit Loss [Line Items]
Increase in mortgage note receivable from sale of real estate							$ 13,000
Prior Period Investment | Senior Living Communities
Financing Receivable, Allowance for Credit Loss [Line Items]
Total					$ 32,700
Commitment Fees
Financing Receivable, Allowance for Credit Loss [Line Items]
Commitment fee								400
After 2021 | Senior Living Communities
Financing Receivable, Allowance for Credit Loss [Line Items]
Loans and lease receivable, maximum revolving amount								$ 15,000
June 2019 Transaction | Senior Living Communities
Financing Receivable, Allowance for Credit Loss [Line Items]
Number of units in real estate property | bedOrUnitInTheProperty					248
Property Held by Fund | Montecito Medical Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Number of real estate properties acquired | property								9
Real estate investments during the period								$ 86,700
Negotiations to sale | Bickford Senior Living
Financing Receivable, Allowance for Credit Loss [Line Items]
Properties | property							6														6
Current Period Investment | Encore Senior Living
Financing Receivable, Allowance for Credit Loss [Line Items]
Number of units in real estate property | property		108