Mortgage And Other Notes Receivable (Narrative) (Details) $ in Thousands		3 Months Ended		9 Months Ended
	Sep. 21, 2023 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) property	Sep. 30, 2022 USD ($)	Sep. 30, 2023 property	Sep. 30, 2023 mortgage	Sep. 30, 2023 bedOrUnitInTheProperty	Sep. 30, 2023 operator	Sep. 30, 2023	Sep. 30, 2023 realEstateInvestment	Sep. 30, 2023 renewalOption	Sep. 30, 2023 loan	Sep. 20, 2023 USD ($)	Dec. 31, 2022 USD ($)	Sep. 30, 2021 property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of health care properties related to mortgage notes receivables						14	14
Credit loss reserve		$ (15,808)		$ (15,808)											$ (15,338)
Financing receivable, excluding accrued interest, after allowance for credit loss		(242,960)		(242,960)											(233,141)
Collections of mortgage and other notes receivable				(11,231)	$ (117,973)
Loans and leases agreement				145,400
Interest income and other		5,484	$ 4,891	16,005	19,584
Increase rate in the amount of loss from a default										20.00%
Effective adjustment rate										44.00%
Montecito Medical Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage and other notes receivable, net		20,300		20,300
Interest income and other		500		1,400
Loans and leases agreement				$ 50,000
Number of real estate investments | realEstateInvestment											2
Investment accrue interest rate										7.50%
Deferred interest rate to be paid upon certain future events										4.50%
Annual interest rate from master credit agreement										9.50%
Deferred interest										2.50%
Loan agreement term				5 years
Number of extensions | renewalOption												2
Note receivable renewal term				1 year
Bickford
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage and other notes receivable, net		16,827		$ 16,827
Properties | property						39
Interest income and other		300	300	1,000	1,000
Repayments of term loan		100		300
Bickford Note Investment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contingent incentive payments		2,000		2,000
Senior Living
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage and other notes receivable, net		48,950		48,950
Number of extensions | property						2
Revolving amount line of credit		20,000		20,000
Revolving note receivable amount outstanding		(16,300)		$ (16,300)
Loans receivable facility bears interest rate				8.00%
Purchase option at a stated minimum price		38,300		$ 38,300
Senior Living Communities
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, renewal term				1 year
Non-performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of operators/borrowers | operator									1
Interest income and other		500	$ 500	$ 1,400	$ 1,400
Mortgage notes receivable, designated as nonperforming		(2,100)
Mezzanine
Accounts, Notes, Loans and Financing Receivable [Line Items]
Credit loss reserve		(10,000)		(10,000)											(10,000)
Mezzanine | Non-performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, excluding accrued interest, after allowance for credit loss		(14,500)		(14,500)											$ (14,500)
Secured By Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage and other notes receivable, net		159,400		159,400
Not Secured By Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Mortgage and other notes receivable, net		99,400		$ 99,400
Capital Funding Group, Inc.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, excluding accrued interest, after allowance for credit loss	$ (25,000)													$ (8,100)
Financing receivable, stated interest rate	10.00%
Property Held by Fund | Montecito Medical Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of medical office buildings | property				9
Combined purchase price of medical office buildings				$ 86,700
Fully Funded | Bickford
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases agreement				14,700
Number of construction loans | loan													1
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Bickford
Accounts, Notes, Loans and Financing Receivable [Line Items]
Properties | property																6
Note receivable interest rate																10.00%
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Bickford Note Investment | Unlikely to be Collected Financing Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase in notes receivable from sales of real estate				(12,700)
After 2021 | Senior Living
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revolving amount line of credit		$ 15,000		15,000
July 2019 Transaction | Senior Living
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases agreement				$ 32,700
Annual interest rate from master credit agreement										7.25%
Loan agreement term				5 years
Number of units acquired in a assisted living facility | bedOrUnitInTheProperty								248