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Investments In Securities and Fair Value (Schedule of Equity Securities) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity Securities, Cost | $ 19,424 | $ 25,278
Equity securities, estimated fair value | 31,831 | 51,691
Common stocks |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity Securities, Cost | 19,424 | 25,278
Equity securities, estimated fair value | $ 31,831 | $ 51,691

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