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Investments In Securities and Fair Value (Schedule Of Gross Realized Gains And Losses On Securities) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Debt Securities, Available-for-sale [Line Items] |  |
Equity securities, realized gains | $ 7,483 | $ 1,747
Debit and equity securities, realized gains | 7,483 | 1,747
Equity securities, realized losses | (121) | 0
Other-than-temporary impairment, gross realized losses | (82) | 0
Debt and equity securities, realized loss | (203) | 0
Debt and equity securities, net realized gain (loss) | 7,280 | 1,747
Gross losses on sales of other investments | (47) | 0
Net gains (losses) on sales of other investments | (47) | 0
Net realized investment gains (losses) | $ 7,233 | $ 1,747

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