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Investments (Summary Of Gross Gains (Losses) From Sales Of Fixed Maturity And Equity Securities) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sales of securities				$ 2,054
Proceeds from sales of equity securities			578,894	329,750
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sales of securities	$ 283,412	$ 402,528	883,149	1,392,801
Gross gains from sales	17,004	18,721	51,738	54,077
Gross losses from sales	(10,785)	(15,291)	(26,285)	(55,104)
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sales of equity securities	116,565	104,231	329,750	578,894
Gross gains from sales	9,512	2,768	30,268	20,875
Gross losses from sales	$ (10,829)	$ (3,257)	$ (42,910)	$ (11,371)

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