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Investments (Summary Of Components Of Net Investment Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross investment income before adjustments | $ 189,229 | $ 171,220 | $ 523,050 | $ 464,410
Funds held interest income (expense) | 2,325 | 1,003 | 9,715 | 6,572
Future policy benefit reserve income (expense) | (372) | (431) | (965) | (999)
Gross investment income | 191,182 | 171,792 | 531,800 | 469,983
Investment expenses | (10,124) | (10,429) | (30,738) | (29,004)
Net investment income | 181,058 | 161,363 | 501,062 | 440,979
Fixed Maturity Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross investment income before adjustments | 130,139 | 119,513 | 383,440 | 343,019
Equity Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross investment income before adjustments | 4,147 | 5,380 | 12,250 | 18,879
Short Term Investments [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross investment income before adjustments | 3,899 | 5,005 | 13,497 | 8,829
Limited Partnerships [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross investment income before adjustments | 43,758 | 38,342 | 100,298 | 83,719
Other [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross investment income before adjustments | $ 7,286 | $ 2,980 | $ 13,565 | $ 9,964

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