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Investments (Components Of Net Investment Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Dividends on equity securities | $ 31,134 | $ 25,962 | $ 84,968 | $ 74,289
Total investment income | 196,266 | 116,549 | 534,070 | 314,093
Investment expenses | (4,059) | (3,935) | (12,835) | (12,380)
Net investment income | 192,207 | 112,614 | 521,235 | 301,713
Fixed Maturities [Member] |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Interest income | 98,891 | 72,477 | 269,438 | 215,541
Short-term investments [Member] |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Interest income | 26,768 | 10,316 | 77,099 | 14,644
Cash and Cash Equivalents |  |  |  |
Schedule of Investment Income, Reported Amounts, by Category [Line Items] |  |  |  |
Interest income | $ 39,473 | $ 7,794 | $ 102,565 | $ 9,619

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