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Investments In Securities and Fair Value (Schedule of Equity Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities, cost | $ 22,647 | $ 22,981
Equity securities, estimated fair value | 36,708 | 37,212
Common stocks |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities, cost | 22,647 | 22,981
Equity securities, estimated fair value | $ 36,708 | $ 37,212

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