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Investments (Components Of Net Investment Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Dividends on equity securities | $ 26,352 | $ 23,590 | $ 53,834 | $ 48,327
Total investment income | 173,974 | 100,887 | 337,804 | 197,544
Investment expenses | (4,281) | (4,092) | (8,776) | (8,445)
Net investment income | 169,693 | 96,795 | 329,028 | 189,099
Fixed Maturities [Member] |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Interest income | 88,419 | 71,920 | 170,547 | 143,064
Short-term investments [Member] |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Interest income | 23,712 | 3,354 | 50,331 | 4,328
Cash and Cash Equivalents |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Interest income | $ 35,491 | $ 2,023 | $ 63,092 | $ 1,825

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