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Fair Value Disclosure (Schedule of Assets and Liabilities) (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Quoted prices in active markets for identical assets (level 1) |  |
Assets: |  |
Equity securities | $ 10,120 | $ 8,716
Total assets accounted for at fair value on a recurring basis | 10,120 | 8,716
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 | 10,120 | 8,716
Total assets accounted for at fair value on a recurring basis | $ 10,120 | $ 8,716

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