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Organization and Summary of Significant Accounting Policies (Narrative) (Details) | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2022 USD ($) Tenant | Mar. 31, 2021 USD ($) Tenant | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Jun. 30, 2021 USD ($) | May 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Accounting Policies [Line Items] |  |  |  |  |  |  |
Interest costs capitalized | $ 98,000 | $ 63,000 |  |  |  |  |
Percentage of total properties for which revenue recognized on cash basis | 5.40% | 6.10% |  |  |  |  |
Percentage of aggregate gross leasable area for which revenue recognized on cash basis | 7.00% | 7.70% |  |  |  |  |
Percentage of tenants for which revenue recognized on cash basis | Tenant | 9 | 12 |  |  |  |  |
Lessor Lease, Rent Deferral Lease Amendments Due To Covid-19, Deferred Rent Originally Due Current Fiscal Year |  |  |  | $ 4,758,000,000 |  |  | $ 52,019,000,000
Lessor Lease, Rent Deferral Lease Amendments Due To Covid-19, Deferred Rent Repaid | $ 4,063,000 |  |  | 31,776,000,000 |  |  |
Revenue recognized on cash basis | 15,786,000,000 | $ 11,314,000 |  |  |  |  |
Revolving credit facility borrowing capacity | 1,100,000,000,000 |  |  |  | $ 1,100,000,000,000 | $ 900,000,000,000 |
Debt costs | $ 10,144,000 |  |  |  |  |  |
Rent repaid |  |  | $ 10,463,000,000 |  |  |  |
Number of tenants | Tenant | 2 |  |  |  |  |  |
Mortgage loan |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Mortgage receivable | $ 1,927,000 |  |  | 2,023,000 |  |  |
Allowance for credit loss | $ 123,000 |  |  | 129,000 |  |  |
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 |  |  |  |  |  |
Line of Credit |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Revolving credit facility borrowing capacity | $ 1,100,000,000 |  |  |  |  |  |
Loans Payable |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |
Debt costs | 38,145,000 |  |  | 38,145,000 |  |  |
Debt costs accumulated amortization | $ 9,859,000 |  |  | $ 9,262,000 |  |  |

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