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Fair Value Disclosure (On a Recurring Basis) (Details) - Fair value measurements, recurring - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Level 1 |  |
Assets: |  |
Equity securities | $ 14,005 | $ 13,164
Assets at fair value | 14,005 | 13,164
Level 2 |  |
Assets: |  |
Equity securities | 0 | 0
Assets at fair value | 0 | 0
Level 3 |  |
Assets: |  |
Equity securities | 0 | 0
Assets at fair value | 0 | 0
Total |  |
Assets: |  |
Equity securities | 14,005 | 13,164
Assets at fair value | $ 14,005 | $ 13,164

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