Investments (Components Of Net Investment Income) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Dividends on equity securities	$ 49,336	$ 40,195
Total investment income	261,720	242,987
Investment expenses	(5,830)	(5,892)
Net investment income	255,890	237,095
Fixed Maturity Securities [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Interest income	164,324	143,345
Short-term investments [Member]
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Interest income	17,104	19,673
Cash and Cash Equivalents
Schedule of Investment Income, Reported Amounts, by Category [Line Items]
Interest income	$ 30,956	$ 39,774

Amount of dividend income on nonoperating securities.

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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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