Organization and Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)	1 Months Ended	3 Months Ended
	Jan. 31, 2023	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Accounting Policies [Line Items]
Interest costs capitalized		$ 405,000	$ 98,000
Revenue recognized on cash basis		15,565,000	15,786,000
Revolving credit facility borrowing capacity		891,000,000,000
Classified as held for sale		3,410,000		$ 786,000
Write-off of outstanding receivables and related accrued rent		232,000	$ 0
Increase in ROU asset and operating lease liability	$ 6,401,000
Escrow and other restricted accounts		$ 2,086,000		4,273,000
Land Improvements [Member]
Accounting Policies [Line Items]
Property estimated useful life		15 years
Mortgage loan
Accounting Policies [Line Items]
Mortgage receivable		$ 1,426,000		1,530,000
Allowance for credit loss		$ 91,000		98,000
Collectability analysis, period used		15 years
Minimum | Building and Building Improvements [Member]
Accounting Policies [Line Items]
Property estimated useful life		20 years
Maximum | Building and Building Improvements [Member]
Accounting Policies [Line Items]
Property estimated useful life		40 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		$ 12,316,000		$ 11,693,000