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Investments (Summary Of Unrealized Appreciation (Depreciation) Of Available For Sale, Fixed Maturity And Equity Security Investments) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 22,063,592	$ 19,225,067
Allowance for credit losses	(29,738)	(1,745)
Unrealized Appreciation	477,548	941,663
Unrealized Depreciation	(203,130)	(124,812)
Market Value	22,308,272	20,040,173
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Allowance for credit losses	(29,738)
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,407,256	1,325,156
Allowance for credit losses
Unrealized Appreciation	23,720	49,084
Unrealized Depreciation	(10,358)	(7,134)
Market Value	1,420,618	1,367,106
Obligations Of U.S. States And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	558,842	543,895
Allowance for credit losses	(151)
Unrealized Appreciation	29,080	34,654
Unrealized Depreciation	(1,150)	(1,254)
Market Value	586,621	577,295
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,443,535	6,824,800
Allowance for credit losses	(19,267)	(1,220)
Unrealized Appreciation	195,210	380,677
Unrealized Depreciation	(62,580)	(55,231)
Market Value	7,556,898	7,149,026
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,579,439	2,540,809
Allowance for credit losses	(7,679)
Unrealized Appreciation	21,817	30,691
Unrealized Depreciation	(11,848)	(5,698)
Market Value	3,581,729	2,565,802
Mortgage-Backed Securities: Commercial [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,032,506	915,923
Allowance for credit losses
Unrealized Appreciation	37,550	75,275
Unrealized Depreciation	(5,690)	(895)
Market Value	1,064,366	990,303
Mortgage Backed Securities: Agency residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,361,208	2,206,139
Allowance for credit losses
Unrealized Appreciation	32,997	64,663
Unrealized Depreciation	(18,873)	(3,063)
Market Value	2,375,332	2,267,739
Mortgage Backed Securities: Non-agency residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	6,530	5,187
Allowance for credit losses
Unrealized Appreciation	22	9
Unrealized Depreciation	(16)	(2)
Market Value	6,536	5,194
Foreign Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,423,634	1,565,260
Allowance for credit losses		(22)
Unrealized Appreciation	41,957	102,587
Unrealized Depreciation	(28,079)	(22,450)
Market Value	1,437,512	1,645,375
Foreign Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,250,642	3,297,898
Allowance for credit losses	(2,641)	(503)
Unrealized Appreciation	95,195	204,023
Unrealized Depreciation	(64,536)	(29,085)
Market Value	$ 4,278,660	$ 3,472,333

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) 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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