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Investments (Summary Of Components Of Net Investment Income) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Schedule of Available-for-sale Securities [Line Items] |  |
Gross investment income before adjustments | $ 266,286 | $ 152,117
Funds held interest income (expense) | 7,966 | 8,216
Future policy benefit reserve income (expense) | (291) | (211)
Gross investment income | 273,961 | 160,122
Investment expenses | (13,548) | (12,322)
Net investment income | 260,413 | 147,800
Fixed Maturity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross investment income before adjustments | 140,916 | 137,924
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross investment income before adjustments | 4,838 | 3,521
Short Term Investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross investment income before adjustments | 180 | 2,175
Limited Partnerships [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross investment income before adjustments | 114,333 | 21,568
Other [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Gross investment income before adjustments | $ 6,019 | $ (13,071)

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