Organization and Summary of Significant Accounting Policies (Narrative) (Details)		3 Months Ended		6 Months Ended
		Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) Segment	Jun. 30, 2023 USD ($)	Apr. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Accounting Policies [Line Items]
Interest costs capitalized		$ 1,617,000	$ 721,000	$ 3,476,000	$ 1,126,000
Revenue recognized on cash basis		11,108,000	$ 14,523,000	20,883,000	30,088,000
Revolving credit facility borrowing capacity		1,188,000,000		$ 1,188,000,000
Number of Operating Segments | Segment				1
Classified as held for sale	[1]	9,442,000		$ 9,442,000			$ 4,573,000
Write-off of outstanding receivables and related accrued rent				473,000	$ 348,000
Escrow and other restricted accounts		$ 14,672,000		$ 14,672,000			3,966,000
Land Improvements [Member]
Accounting Policies [Line Items]
Property estimated useful life		15 years		15 years
Mortgage loan
Accounting Policies [Line Items]
Mortgage receivable		$ 705,000		$ 705,000			1,002,000
Allowance for credit loss		$ 14,000		$ 14,000			64,000
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
Revolving Credit Facility [Member]
Accounting Policies [Line Items]
Revolving credit facility borrowing capacity		$ 1,200,000,000		$ 1,200,000,000		$ 1,100,000,000
Loans Payable
Accounting Policies [Line Items]
Debt costs		43,820,000		43,820,000			42,595,000
Debt costs accumulated amortization		$ 12,606,000		$ 12,606,000			$ 14,343,000

[1] (2) As of June 30, 2024, six Properties were classified as held for sale. The one property classified as held for sale as of December 31, 2023 was sold during the six months ended June 30, 2024.