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Investments (Components Of Net Investment Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Dividends on equity securities | $ 31,831 | $ 26,352 | $ 64,524 | $ 53,834
Total investment income | 227,216 | 173,974 | 450,647 | 337,804
Investment expenses | (4,155) | (4,281) | (9,317) | (8,776)
Net investment income | 223,061 | 169,693 | 441,330 | 329,028
Fixed Maturities [Member] |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Interest income | 121,189 | 88,419 | 240,665 | 170,547
Short-term investments [Member] |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Interest income | 31,654 | 23,712 | 63,838 | 50,331
Cash and Cash Equivalents |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Interest income | $ 42,542 | $ 35,491 | $ 81,620 | $ 63,092

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