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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