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Investments (Summary Of Components Of Net Realized Capital Gains (Losses)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Total net realized capital gains (losses)	$ 257,943	$ 267,649	$ 185,004
Beginning Balance	(1,745)
Credit losses on securities where credit losses were not previously recorded	(28,679)	(32,884)
Increases in allowance on previously impaired securities	(5,293)	(6,645)
Decrease in allowance on previously impaired securities		5,525
Reduction in allowance due to disposals	5,979	32,259
Ending Balance	(29,738)	(1,745)
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Ending Balance	(29,738)
Fixed Maturity Securities [Member] \| Market Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Allowance for credit losses	(27,992)	(1,745)
Other-than-temporary Impairments			(20,899)
Gains (losses) from sales	16,503	(2,214)	28,025
Fixed Maturity Securities [Member] \| Fair Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales		(2,863)	355
Gains (losses) from fair value adjustments		1,944	1,808
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance	(1,220)
Credit losses on securities where credit losses were not previously recorded	(21,177)	(27,666)
Increases in allowance on previously impaired securities	(2,529)	(6,136)
Decrease in allowance on previously impaired securities		4,333
Reduction in allowance due to disposals	5,659	28,249
Ending Balance	(19,267)	(1,220)
Equity Securities [Member] \| Fair Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	27,596	(8,963)	4,148
Gains (losses) from fair value adjustments	235,686	278,461	165,200
Other Invested Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	6,142	1,705	6,003
Short-Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	8	1,324	364
Asset Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance
Credit losses on securities where credit losses were not previously recorded	(4,915)
Increases in allowance on previously impaired securities	(2,764)
Decrease in allowance on previously impaired securities
Reduction in allowance due to disposals
Ending Balance	(7,679)
Obligations Of U.S. States And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance
Credit losses on securities where credit losses were not previously recorded	(151)
Increases in allowance on previously impaired securities
Decrease in allowance on previously impaired securities
Reduction in allowance due to disposals
Ending Balance	(151)
Foreign Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance	(22)
Credit losses on securities where credit losses were not previously recorded		(518)
Increases in allowance on previously impaired securities		(28)
Decrease in allowance on previously impaired securities		309
Reduction in allowance due to disposals	22	215
Ending Balance		(22)
Foreign Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance	(503)
Credit losses on securities where credit losses were not previously recorded	(2,436)	(4,700)
Increases in allowance on previously impaired securities		(481)
Decrease in allowance on previously impaired securities		883
Reduction in allowance due to disposals	298	3,795
Ending Balance	$ (2,641)	$ (503)