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Investments (Components Of Net Investment Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Dividends on equity securities	$ 35,762	$ 36,739	$ 110,769	$ 101,263
Total investment income	248,296	240,354	727,227	691,001
Investment expenses	(2,621)	(4,877)	(14,448)	(14,194)
Net investment income	245,675	235,477	712,779	676,807
Fixed Maturity Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Interest income	155,645	131,424	444,819	372,089
Short-term investments [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Interest income	19,406	30,971	58,659	94,809
Cash and Cash Equivalents
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Interest income	$ 37,483	$ 41,220	$ 112,980	$ 122,840

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