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Fair Value Disclosure (Schedule of Assets and Liabilities) (Details) - Fair value measurements, recurring - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets: |  |
Equity securities | $ 15,702 | $ 15,534
Total assets accounted for at fair value on a recurring basis | 15,702 | 15,534
Significant Other Observable Inputs (Level 2) |  |
Assets: |  |
Equity securities | 0 | 0
Total assets accounted for at fair value on a recurring basis | 0 | 0
Significant Unobservable Inputs (Level 3) |  |
Assets: |  |
Equity securities | 0 | 0
Total assets accounted for at fair value on a recurring basis | 0 | 0
Estimate of Fair Value Measurement |  |
Assets: |  |
Equity securities | 15,702 | 15,534
Total assets accounted for at fair value on a recurring basis | $ 15,702 | $ 15,534

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