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Investments (Summary Of Components Of Net Investment Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross investment income before adjustments | $ 48,051 | $ 188,124 | $ 200,168 | $ 333,821
Funds held interest income (expense) | 2,021 | 1,422 | 10,237 | 7,390
Future policy benefit reserve income (expense) | (303) | (359) | (514) | (593)
Gross investment income | 49,769 | 189,187 | 209,891 | 340,618
Investment expenses | (11,686) | (10,159) | (24,008) | (20,614)
Net investment income | 38,083 | 179,028 | 185,883 | 320,004
Fixed Maturity Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross investment income before adjustments | 133,918 | 126,593 | 271,842 | 253,301
Equity Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross investment income before adjustments | 3,662 | 4,596 | 7,183 | 8,103
Short-Term Investments and Cash [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross investment income before adjustments | 1,687 | 5,393 | 3,862 | 9,598
Limited Partnerships [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross investment income before adjustments | (88,254) | 48,243 | (66,686) | 56,540
Other [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross investment income before adjustments | $ (2,962) | $ 3,299 | $ (16,033) | $ 6,279

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