Organization and Summary of Significant Accounting Policies (Narrative) (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2022 USD ($) Tenant	Mar. 31, 2021 USD ($) Tenant	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jun. 30, 2021 USD ($)	May 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Accounting Policies [Line Items]
Interest costs capitalized	$ 98,000	$ 63,000
Percentage of total properties for which revenue recognized on cash basis	5.40%	6.10%
Percentage of aggregate gross leasable area for which revenue recognized on cash basis	7.00%	7.70%
Percentage of tenants for which revenue recognized on cash basis | Tenant	9	12
Lessor Lease, Rent Deferral Lease Amendments Due To Covid-19, Deferred Rent Originally Due Current Fiscal Year				$ 4,758,000,000			$ 52,019,000,000
Lessor Lease, Rent Deferral Lease Amendments Due To Covid-19, Deferred Rent Repaid	$ 4,063,000			31,776,000,000
Revenue recognized on cash basis	15,786,000,000	$ 11,314,000
Revolving credit facility borrowing capacity	1,100,000,000,000				$ 1,100,000,000,000	$ 900,000,000,000
Debt costs	$ 10,144,000
Rent repaid			$ 10,463,000,000
Number of tenants | Tenant	2
Mortgage loan
Accounting Policies [Line Items]
Mortgage receivable	$ 1,927,000			2,023,000
Allowance for credit loss	$ 123,000			129,000
Collectability analysis, period used	15 years
Minimum
Accounting Policies [Line Items]
Initial lease term	10 years
Maximum
Accounting Policies [Line Items]
Initial lease term	20 years
Line of Credit
Accounting Policies [Line Items]
Revolving credit facility borrowing capacity	$ 1,100,000,000
Loans Payable
Accounting Policies [Line Items]
Debt costs	38,145,000			38,145,000
Debt costs accumulated amortization	$ 9,859,000			$ 9,262,000