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Investments (Summary Of Gross Gains (Losses) From Sales Of Fixed Maturity And Equity Securities) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Fixed Maturity Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Proceeds from sales of securities | $ 488,320 | $ 522,687 | $ 990,273 | $ 2,320,913
Gross gains from sales | 21,355 | 11,908 | 35,356 | 28,046
Gross losses from sales | (11,736) | (5,455) | (39,813) | (16,320)
Equity Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Proceeds from sales of securities | 100,344 | 79,733 | 213,185 | 149,233
Gross gains from sales | 18,172 | 2,576 | 20,756 | 8,251
Gross losses from sales | $ (1,898) | $ (3,891) | $ (32,081) | $ (4,518)

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