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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
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Debt Securities, Available-for-sale [Line Items] |  |
Debit and equity securities, realized gains | $ 2,807 | $ 7,483
Other-than-temporary impairment, gross realized losses | (53) | (82)
Debt and equity securities, realized loss | (215) | (203)
Debt and equity securities, net realized gain (loss) | 2,592 | 7,280
Gross losses on sales of other investments | 0 | (47)
Net gains (losses) on sales of other investments | 0 | (47)
Net realized investment gains (losses) | 2,592 | 7,233
Unrealized Gain (Loss) on Investments | (170) | (6,790)
Gain (loss) on investments | 2,422 | 443
Common Stocks And Nonredeemable Preferred Stocks |  |
Debt Securities, Available-for-sale [Line Items] |  |
Equity securities, realized gains | 2,807 | 7,483
Equity securities, realized losses | $ (162) | $ (121)

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