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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 |  |  |

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