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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
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Fixed Maturity Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Proceeds from sales of securities | $ 371,459 | $ 488,320 | $ 599,737 | $ 990,273
Gross gains from sales | 19,870 | 21,355 | 34,734 | 35,356
Gross losses from sales | (9,810) | (11,736) | (15,500) | (39,813)
Equity Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Proceeds from sales of securities | 193,350 | 100,344 | 474,663 | 213,185
Gross gains from sales | 5,803 | 18,172 | 18,107 | 20,756
Gross losses from sales | $ (2,048) | $ (1,898) | $ (8,114) | $ (32,081)

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