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Investments (Summary Of Components Of Net Investment Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross investment income before adjustments | $ 241,531 | $ 418,349 | $ 494,330 | $ 684,635
Funds held interest income (expense) | 772 | 3,287 | 4,457 | 11,253
Future policy benefit reserve income (expense) | (128) | (170) | (350) | (461)
Gross investment income | 242,175 | 421,466 | 498,437 | 695,427
Investment expenses | (16,197) | (14,371) | (29,629) | (27,919)
Net investment income | 225,978 | 407,095 | 468,808 | 667,508
Fixed Maturity Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross investment income before adjustments | 168,769 | 148,262 | 316,995 | 289,178
Equity Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross investment income before adjustments | 4,600 | 3,493 | 8,746 | 8,331
Short Term Investments [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross investment income before adjustments | 6,587 | 773 | 6,746 | 953
Limited Partnerships [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross investment income before adjustments | 47,584 | 239,966 | 136,021 | 354,299
Other [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Gross investment income before adjustments | $ 13,991 | $ 25,855 | $ 25,822 | $ 31,874

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