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Investments In Securities and Fair Value (Schedule Of Gross Realized and Unrealized Gains And Losses On Securities) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Marketable Security, Gain (Loss) [Abstract] |  |  |  |
Equity securities, realized gains | $ 1,749 | $ 2,564 | $ 15,449 | $ 7,120
Debit and equity securities, realized gains | 1,749 | 2,564 | 15,449 | 7,120
Debt Securities, Available-for-sale, Realized Loss | 0 | (58) | 0 | (104)
Equity securities, realized losses | (77) | (20) | (400) | (209)
Write-down of securities | (96) | (35) | (208) | (162)
Debt and Equity Securities, Realized Loss | (173) | (113) | (608) | (475)
Debt and equity securities, net realized gain (loss) | 1,576 | 2,451 | 14,841 | 6,645
Gains On Other Assets and Investments | 5 | 30 | 5 | 30
Gross losses on sales of other investments | (4) | 0 | (120) | (409)
Net gains (losses) on sales of other investments | 1 | 30 | (115) | (379)
Net realized investment gains (losses) | 1,577 | 2,481 | 14,726 | 6,266
Unrealized Gain (Loss) on Investments | (2,392) | (4,635) | (14,006) | (22,722)
Gain (Loss) on Investments | $ (815) | $ (2,154) | $ 720 | $ (16,456)

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