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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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