Organization and Summary of Significant Accounting Policies (Narrative) (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) Segment Tenant	Dec. 31, 2020 USD ($) Segment	Dec. 31, 2019 USD ($) Tenant Segment	Jun. 30, 2021 USD ($)	May 31, 2021 USD ($)
Debt Instrument [Line Items]
Number of operating segments | Segment	1	1	1
Interest costs capitalized	$ 328,000	$ 1,388,000	$ 1,099,000
Real estate acquisitions	531,726,000	137,667,000
Investments in work in progress - improvements	23,689,000	42,300,000
Write-off of outstanding receivables and related accrued rent	$ 0	21,792,000
Percentage of total properties for which revenue recognized on cash basis	6.00%
Percentage of aggregate gross leasable area for which revenue recognized on cash basis	7.00%
Number of tenants for which revenue recognized on cash basis | Tenant	11		0
Revenue recognized on cash basis	$ 52,129,000	4,722,000
Revolving credit facility borrowing capacity	1,100,000,000			$ 1,100,000,000,000	$ 900,000,000,000
Deferred debt costs, accumulated amortization	19,377,000	17,294,000
Unrecognized tax benefits	0
Income tax penalties and interest expense	$ 0
Land improvements
Debt Instrument [Line Items]
Property estimated useful life	15 years
Mortgage receivable
Debt Instrument [Line Items]
Mortgage receivable	$ 2,023,000	2,482,000
Allowance for credit loss	$ 129,000	158,000
Collectability analysis, period used	15 years
Minimum
Debt Instrument [Line Items]
Initial lease terms	10 years
Minimum | Buildings and improvements
Debt Instrument [Line Items]
Property estimated useful life	20 years
Maximum
Debt Instrument [Line Items]
Initial lease terms	20 years
Maximum | Buildings and improvements
Debt Instrument [Line Items]
Property estimated useful life	40 years
Mortgages
Debt Instrument [Line Items]
Deferred debt costs	$ 147,000	147,000
Deferred debt costs, accumulated amortization	125,000	108,000
Notes Payable
Debt Instrument [Line Items]
Deferred debt costs	38,145,000	31,140,000
Deferred debt costs, accumulated amortization	$ 9,262,000	$ 9,317,000