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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, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Marketable Security, Gain (Loss) [Abstract] |  |  |  |
Corporate debt securities, realized gains | $ 1 | $ 0 | $ 6 | $ 0
Equity securities, realized gains | 1,033 | 444 | 5,189 | 5,157
Debit and equity securities, realized gains | 1,034 | 444 | 5,195 | 5,157
Equity securities, realized losses | (127) | (122) | (740) | (339)
Write-down of securities | 0 | 0 | 0 | (74)
Debt and equity securities, realized loss | (127) | (122) | (740) | (413)
Debt and equity securities, net realized gain (loss) | 907 | 322 | 4,455 | 4,744
Gross gains on other investments | 0 | 242 | 1 | 243
Losses on other assets and investments | 0 | (20) | 0 | (20)
Write-down of other assets | (50) | (309) | (469) | (309)
Net gains (losses) on other investments | (50) | (87) | (468) | (86)
Net realized investment gains (losses) | 857 | 235 | 3,987 | 4,658
Unrealized gain (loss) on investments | 1,200 | 741 | (1,005) | (18)
Net investment gains | $ 2,057 | $ 976 | $ 2,982 | $ 4,640

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