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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Total, gross realized gains |  |  | $ 1,604 | $ 952
Total, gross realized losses |  |  | (1,490) | (177)
Net realized gains from securities |  |  | 114 | 775
Gain on other investments |  |  | 32 | 1
Losses on Other Assets and Investments |  |  | (5) | 0
Total |  |  | 27 | 1
Net realized investment gains | $ 553 | $ (14) | 141 | 776
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 |  |  | 1,574 | 952
Equity securities, realized loss |  |  | (1,008) | (177)
Other-than-temporary impairment of securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Total, gross realized losses |  |  | $ (482) | $ 0

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