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Investments (Summary Of Components Of Net Investment Income) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross investment income before adjustments | $ 677,347 | $ 615,802 | $ 559,773
Funds held interest income (expense) | 13,271 | 6,300 | 11,874
Future policy benefit reserve income (expense) | (1,380) | (1,419) | (1,282)
Gross investment income | 689,238 | 620,683 | 570,365
Investment expenses | (42,099) | (39,500) | (27,467)
Net investment income | 647,139 | 581,183 | 542,898
Fixed Maturity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross investment income before adjustments | 520,291 | 465,793 | 427,379
Equity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross investment income before adjustments | 19,505 | 25,327 | 34,523
Short Term Investments [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross investment income before adjustments | 17,619 | 14,395 | 4,177
Limited Partnerships [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross investment income before adjustments | 105,815 | 93,327 | 83,569
Other [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Gross investment income before adjustments | $ 14,117 | $ 16,960 | $ 10,125

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