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Organization and Summary of Significant Accounting Policies (Narrative) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) numberOfTenants | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) numberOfTenants | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | Jan. 01, 2019 USD ($)
Accounting Policies [Line Items] |  |  |  |  |  |
Interest costs capitalized | $ 332 | $ 327 | $ 1,218 | $ 797 |  |
Accounting Standards Update [Extensible List] |  |  |  | us-gaap:AccountingStandardsUpdate201602Member |  |
Write-off of outstanding receivables and related accrued rent | 14,758 |  | 14,758 |  |  |
Revenue recognized on cash basis | $ 2,203 | $ 0 | $ 2,406 | $ 0 |  |
Percentage of total properties for which revenue recognized on cash basis | 4.00% |  | 4.00% |  |  |
Percentage of aggregate gross leasable area for which revenue recognized on cash basis | 6.00% |  | 6.00% |  |  |
Percentage of tenants for which revenue recognized on cash basis | numberOfTenants | 6 |  | 6 |  |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Operating lease – ROU assets |  |  |  |  |  | $ 7,735
Operating lease – lease liabilities |  |  |  |  |  | $ 10,155
Mortgage loan |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Mortgage receivable | $ 2,569 |  | $ 2,569 |  |  |
Allowance for credit loss | 164 |  | $ 164 |  |  |
Collectability analysis, period used |  |  | 15 years |  |  |
Minimum |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Impact of COVID-19, requested rent deferral |  |  | 30 days |  |  |
Impact of COVID-19, requested rent deferral, period of payment |  |  | 3 months |  |  |
Initial lease term |  |  | 10 years |  |  |
Maximum |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Impact of COVID-19, requested rent deferral |  |  | 90 days |  |  |
Impact of COVID-19, requested rent deferral, period of payment |  |  | 18 months |  |  |
Initial lease term |  |  | 20 years |  |  |
Notes Payable to Banks |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Debt costs | 31,140 |  | $ 31,140 |  | $ 26,932 |
Debt costs accumulated amortization | $ 8,705 |  | $ 8,705 |  | $ 8,962 |

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