Organization and Summary of Significant Accounting Policies (Narrative) (Details)	3 Months Ended
	Mar. 31, 2024 USD ($) Segment		Mar. 31, 2023 USD ($)	Apr. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Accounting Policies [Line Items]
Interest costs capitalized	$ 1,859,000		$ 405,000
Revenue recognized on cash basis	9,775,000		15,565,000
Revolving credit facility borrowing capacity	$ 983,800,000,000			$ 1,200,000,000
Number of Operating Segments | Segment	1
Classified as held for sale	$ 22,239,000	[1]	4,573,000		$ 4,573,000	[1]
Write-off of outstanding receivables and related accrued rent	444,000		$ 232,000
Escrow and other restricted accounts	$ 0				3,966,000
Land Improvements [Member]
Accounting Policies [Line Items]
Property estimated useful life	15 years
Mortgage loan
Accounting Policies [Line Items]
Mortgage receivable	$ 926,000				1,002,000
Allowance for credit loss	$ 19,000				64,000
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	42,595,000
Debt costs accumulated amortization	$ 15,071,000				$ 14,343,000

[1] (2) As of March 31, 2024, five Properties were classified as held for sale. The property classified as held for sale as of December 31, 2023 was sold during the quarter ended March 31, 2024.