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Investments In Securities and Fair Value (Schedule of Equity Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities, cost | $ 23,540 | $ 22,981
Equity securities, estimated fair value | 37,753 | 37,212
Common stocks |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities, cost | 23,540 | 22,981
Equity securities, estimated fair value | $ 37,753 | $ 37,212

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