Investments (Components Of Net Investment Income) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Dividends on equity securities	$ 43,827	$ 34,812	$ 93,163	$ 75,007
Total investment income	259,019	235,944	520,739	478,931
Investment expenses	(2,896)	(5,935)	(8,726)	(11,827)
Net investment income	256,123	230,009	512,013	467,104
Fixed Maturity Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Interest income	169,196	145,829	333,520	289,174
Short-term investments [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Interest income	17,699	19,580	34,803	39,253
Cash and Cash Equivalents
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Interest income	$ 28,297	$ 35,723	$ 59,253	$ 75,497

Amount of dividend income on nonoperating securities.

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Amount of expenses related to the generation of investment income.

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Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

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