Investments (Summary Of Components Of Net Realized Capital Gains (Losses)) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Schedule of Available-for-sale Securities [Line Items]
Total net realized capital gains (losses)	$ 104,109	$ 184,648	$ 143,011	$ (25,940)
Beginning Balance	(8,723)	(21,774)	(1,745)
Credit losses on securities where credit losses were not previously recorded	(14,592)	(10,960)	(21,890)	(32,734)
Increases in allowance on previously impaired securities	(1,468)	(1,082)	(1,468)	(1,082)
Decrease in allowance on previously impaired securities		4,336		4,336
Reduction in allowance due to disposals	133	3,643	453	3,643
Ending Balance	(24,650)	(25,837)	(24,650)	(25,837)
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance			(1,745)
Ending Balance	(24,650)		(24,650)
Fixed Maturity Securities [Member] \| Market Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Allowance for credit losses	(15,927)	(4,063)	(22,904)	(25,837)
Gains (losses) from sales	10,060	9,619	19,234	(4,457)
Fixed Maturity Securities [Member] \| Fair Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales
Gains (losses) from fair value adjustments		(272)		(1,395)
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance	(3,603)	(17,305)	(1,220)
Credit losses on securities where credit losses were not previously recorded	(13,537)	(10,355)	(15,920)	(27,660)
Increases in allowance on previously impaired securities	(1,468)	(782)	(1,468)	(782)
Decrease in allowance on previously impaired securities		3,431		3,431
Reduction in allowance due to disposals	133	2,758	133	2,758
Ending Balance	(18,475)	(22,253)	(18,475)	(22,253)
Equity Securities [Member] \| Fair Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	3,755	16,274	9,993	(11,325)
Gains (losses) from fair value adjustments	103,525	161,694	132,581	17,691
Other Invested Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	2,748	1,293	4,094	(1,034)
Short-Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales	(52)	103	13	417
Asset Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance	(4,915)
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	(4,915)		(4,915)
Foreign Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance		(519)	(22)
Credit losses on securities where credit losses were not previously recorded				(519)
Increases in allowance on previously impaired securities
Decrease in allowance on previously impaired securities		212		212
Reduction in allowance due to disposals		215	22	215
Ending Balance		(92)		(92)
Foreign Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Beginning Balance	(205)	(3,950)	(503)
Credit losses on securities where credit losses were not previously recorded	(1,055)	(605)	(1,055)	(4,555)
Increases in allowance on previously impaired securities		(300)		(300)
Decrease in allowance on previously impaired securities		693		693
Reduction in allowance due to disposals		670	298	670
Ending Balance	$ (1,260)	$ (3,492)	$ (1,260)	$ (3,492)

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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