Organization and Summary of Significant Accounting Policies (Narrative) (Details) - USD ($)		1 Months Ended	3 Months Ended		9 Months Ended
		Jan. 31, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Accounting Policies [Line Items]
Interest costs capitalized			$ 1,248,000	$ 273,000	$ 2,374,000	$ 547,000
Revenue recognized on cash basis			14,281,000	$ 15,346,000	44,368,000	46,631,000
Revolving credit facility borrowing capacity			1,100,000,000,000		1,100,000,000,000
Classified as held for sale	[1]		0		0		$ 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			$ 21,126,000		$ 21,126,000		4,273,000
Land Improvements [Member]
Accounting Policies [Line Items]
Property estimated useful life			15 years		15 years
Mortgage loan
Accounting Policies [Line Items]
Mortgage receivable			$ 1,114,000		$ 1,114,000		1,530,000
Allowance for credit loss			$ 71,000		$ 71,000		98,000
Collectability analysis, period used					15 years
Minimum | Building and Building Improvements [Member]
Accounting Policies [Line Items]
Property estimated useful life			20 years		20 years
Maximum | Building and Building Improvements [Member]
Accounting Policies [Line Items]
Property estimated useful life			40 years		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			42,595,000		42,595,000		38,145,000
Debt costs accumulated amortization			$ 13,621,000		$ 13,621,000		$ 11,693,000

[1] (2) As of September 30, 2023, no Properties were classified as held for sale.