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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Fixed Maturity Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Proceeds from sales of securities | $ 522,687 | $ 862,150 | $ 2,320,913 | $ 1,226,438
Gross gains from sales | 11,908 | 6,824 | 28,046 | 19,826
Gross losses from sales | (5,455) | (7,935) | (16,320) | (10,559)
Equity Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Proceeds from sales of securities | 79,733 | 376,507 | 149,233 | 576,382
Gross gains from sales | 2,576 | 7,359 | 8,251 | 14,046
Gross losses from sales | $ (3,891) | $ (8,922) | $ (4,518) | $ (15,569)

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