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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