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Investments (Summary Of Gross Gains (Losses) From Sales Of Fixed Maturity And Equity Securities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sales of securities		$ 4,907	$ 2,917
Proceeds from sales of equity securities	990,376	376,347	283,965
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sales of securities	1,915,916	1,950,774	3,283,154
Gross gains from sales	71,744	79,609	63,721
Gross losses from sales	(55,241)	(84,686)	(35,341)
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sales of equity securities	990,376	376,347	283,965
Gross gains from sales	42,241	37,415	14,274
Gross losses from sales	$ (14,645)	$ (46,378)	$ (10,126)

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Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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