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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, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Marketable Security, Gain (Loss) [Abstract] |  |  |  |
Equity securities, realized gains | $ 444 | $ 1,749 | $ 5,157 | $ 15,449
Debit and equity securities, realized gains | 444 | 1,749 | 5,157 | 15,449
Equity securities, realized losses | (122) | (77) | (339) | (400)
Write-down of securities | 0 | (96) | (74) | (208)
Debt and Equity Securities, Realized Loss | (122) | (173) | (413) | (608)
Debt and equity securities, net realized gain (loss) | 322 | 1,576 | 4,744 | 14,841
Gross gains on other investments | 242 | 5 | 243 | 5
Gross losses on other investments | (20) | (4) | (20) | (120)
Write-down of other assets | (309) | 0 | (309) | 0
Net gains (losses) on other investments | (87) | 1 | (86) | (115)
Net realized investment gains (losses) | 235 | 1,577 | 4,658 | 14,726
Unrealized gain (loss) on investments | 741 | (2,392) | (18) | (14,006)
Gain (loss) on investments | $ 976 | $ (815) | $ 4,640 | $ 720

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