Investments (Summary Of Components Of Net Realized Capital Gains (Losses)) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2022	Mar. 31, 2021
Schedule of Available-for-sale Securities [Line Items]
Total net gains (losses) on investments	$ (153,627)	$ 38,902
Beginning Balance	(29,738)	(1,745)
Credit losses on securities where credit losses were not previously recorded	(13,113)	(7,298)
Increases in allowance on previously impaired securities
Decrease in allowance on previously impaired securities
Reduction in allowance due to disposals	1,260	320
Ending Balance	(41,591)	(8,723)
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance	(29,738)
Ending Balance	(41,591)
Fixed Maturity Securities [Member] \| Market Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Allowance for credit losses	(11,853)	(6,977)
Gains (losses) from sales	2,799	9,174
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance	(19,267)	(1,220)
Credit losses on securities where credit losses were not previously recorded	(1,929)	(2,383)
Increases in allowance on previously impaired securities
Decrease in allowance on previously impaired securities
Reduction in allowance due to disposals	1,147
Ending Balance	(20,049)	(3,603)
Equity Securities [Member] \| Fair Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	(11,787)	6,238
Gains (losses) from fair value adjustments	(136,860)	29,056
Other Invested Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	4,152	1,346
Short-Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	(78)	66
Asset Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance	(7,679)
Credit losses on securities where credit losses were not previously recorded		(4,915)
Increases in allowance on previously impaired securities
Decrease in allowance on previously impaired securities
Reduction in allowance due to disposals
Ending Balance	(7,679)	(4,915)
Obligations Of U.S. States And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance	(151)
Credit losses on securities where credit losses were not previously recorded
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
Increases in allowance on previously impaired securities
Decrease in allowance on previously impaired securities
Reduction in allowance due to disposals		22
Ending Balance
Foreign Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance	(2,641)	(503)
Credit losses on securities where credit losses were not previously recorded	(11,184)
Increases in allowance on previously impaired securities
Decrease in allowance on previously impaired securities
Reduction in allowance due to disposals	113	298
Ending Balance	$ (13,712)	$ (205)

Amount of allowance for credit loss 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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