Investments (Summary Of Components Of Net Realized Capital Gains (Losses)) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Schedule of Available-for-sale Securities [Line Items]
Total net gains (losses) on investments	$ (236,265)	$ 104,109	$ (389,892)	$ 143,011
Beginning Balance	(41,591)	(8,723)	(29,738)	(1,745)
Credit losses on securities where credit losses were not previously recorded	(9,593)	(14,592)	(22,706)	(21,890)
Increases in allowance on previously impaired securities	(1,386)	(1,468)	(1,386)	(1,468)
Decrease in allowance on previously impaired securities
Reduction in allowance due to disposals	9,856	133	11,116	453
Ending Balance	(42,714)	(24,650)	(42,714)	(24,650)
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance			(29,738)
Ending Balance	(42,714)		(42,714)
Fixed Maturity Securities [Member] \| Market Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Allowance for credit losses	(1,490)	(15,927)	(13,343)	(22,904)
Gains (losses) from sales	(15,560)	10,060	(12,761)	19,234
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance	(20,049)	(3,603)	(19,267)	(1,220)
Credit losses on securities where credit losses were not previously recorded	(4,887)	(13,537)	(6,816)	(15,920)
Increases in allowance on previously impaired securities	(654)	(1,468)	(654)	(1,468)
Decrease in allowance on previously impaired securities
Reduction in allowance due to disposals	7	133	1,154	133
Ending Balance	(25,583)	(18,475)	(25,583)	(18,475)
Equity Securities [Member] \| Fair Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	(30,926)	3,755	(42,713)	9,993
Gains (losses) from fair value adjustments	(188,924)	103,525	(325,784)	132,581
Other Invested Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	583	2,748	4,735	4,094
Short-Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	52	(52)	(26)	13
Asset Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance	(7,679)	(4,915)	(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	7,679		7,679
Ending Balance		(4,915)		(4,915)
Obligations Of U.S. States And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance	(151)		(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)		(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	(13,712)	(205)	(2,641)	(503)
Credit losses on securities where credit losses were not previously recorded	(4,706)	(1,055)	(15,890)	(1,055)
Increases in allowance on previously impaired securities	(732)		(732)
Decrease in allowance on previously impaired securities
Reduction in allowance due to disposals	2,170		2,283	298
Ending Balance	$ (16,980)	$ (1,260)	$ (16,980)	$ (1,260)

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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