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Organization and Summary of Significant Accounting Policies (Narrative) (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 USD ($) tenant | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($)
Accounting Policies [Line Items] |  |  |
Interest costs capitalized | $ 63 | $ 466 |
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 | 8.00% |  |
Percentage of tenants for which revenue recognized on cash basis | tenant | 12 |  |
Revenue recognized on cash basis | $ 11,314 | $ 203 |
Mortgage loan |  |  |
Accounting Policies [Line Items] |  |  |
Mortgage receivable | 2,395 |  | $ 2,482
Allowance for credit loss | $ 153 |  | 158
Collectability analysis, period used | 15 years |  |
Minimum |  |  |
Accounting Policies [Line Items] |  |  |
Initial lease term | 10 years |  |
Maximum |  |  |
Accounting Policies [Line Items] |  |  |
Initial lease term | 20 years |  |
Notes Payable to Banks |  |  |
Accounting Policies [Line Items] |  |  |
Debt costs | $ 33,177 |  | 31,140
Debt costs accumulated amortization | $ 7,543 |  | $ 9,317

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