Organization and Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 31, 2023	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Accounting Policies [Line Items]
Interest costs capitalized		$ 721,000	$ 176,000	$ 1,126,000	$ 274,000
Revenue recognized on cash basis		14,523,000	$ 15,499,000	30,088,000	31,285,000
Revolving credit facility borrowing capacity		767,500,000,000		767,500,000,000
Classified as held for sale		1,904,000		1,904,000		$ 786,000
Write-off of outstanding receivables and related accrued rent				348,000,000	$ 0
Increase in ROU asset and operating lease liability	$ 6,401,000
Escrow and other restricted accounts		2,971,000		$ 2,971,000		4,273,000
Land Improvements [Member]
Accounting Policies [Line Items]
Property estimated useful life				15 years
Mortgage loan
Accounting Policies [Line Items]
Mortgage receivable		1,224,000		$ 1,224,000		1,530,000
Allowance for credit loss		78,000		$ 78,000		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		$ 1,100,000,000
Loans Payable
Accounting Policies [Line Items]
Debt costs		38,145,000		38,145,000		38,145,000
Debt costs accumulated amortization		$ 12,946,000		$ 12,946,000		$ 11,693,000