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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Total, gross realized gains |  |  | $ 2,550 | $ 1,385
Total, gross realized losses |  |  | (2,250) | (188)
Net realized gains from securities |  |  | 300 | 1,197
Gain on other investments |  |  | 32 | 2
Losses on Other Assets and Investments |  |  | (5) | 0
Total |  |  | 27 | 2
Net realized investment gains | $ 186 | $ 423 | 327 | 1,199
Corporate debt securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Total, gross realized gains |  |  | 30 | 0
Common stocks |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Equity securities, realized gain |  |  | 2,520 | 1,385
Equity securities, realized loss |  |  | (1,768) | (188)
Other-than-temporary impairment of securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Total, gross realized losses |  |  | $ (482) | $ 0

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