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Investments (Summary Of Unrealized Appreciation (Depreciation) Of Available For Sale, Fixed Maturity And Equity Security Investments) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 20,718,717
Allowance for credit losses	(24,650)	$ (8,723)	$ (1,745)	$ (25,837)	$ (21,774)
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	20,718,717		19,225,067
Allowance for credit losses	(24,650)		(1,745)
Unrealized Appreciation	735,661		941,663
Unrealized Depreciation	(154,529)		(124,812)
Market Value	21,275,199		20,040,173
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,259,149		1,325,156
Allowance for credit losses
Unrealized Appreciation	29,365		49,084
Unrealized Depreciation	(12,756)		(7,134)
Market Value	1,275,758		1,367,106
Obligations Of U.S. States And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	574,398		543,895
Allowance for credit losses
Unrealized Appreciation	35,933		34,654
Unrealized Depreciation	(986)		(1,254)
Market Value	609,345		577,295
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,155,688		6,824,800
Allowance for credit losses	(18,475)	(3,603)	(1,220)	(22,253)	(17,305)
Unrealized Appreciation	285,509		380,677
Unrealized Depreciation	(63,018)		(55,231)
Market Value	7,359,704		7,149,026
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,141,971		2,540,809
Allowance for credit losses	(4,915)	(4,915)
Unrealized Appreciation	35,316		30,691
Unrealized Depreciation	(2,955)		(5,698)
Market Value	3,169,417		2,565,802
Mortgage-Backed Securities: Commercial [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,026,809		915,923
Allowance for credit losses
Unrealized Appreciation	55,125		75,275
Unrealized Depreciation	(3,535)		(895)
Market Value	1,078,399		990,303
Mortgage Backed Securities: Agency residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,255,348		2,206,139
Allowance for credit losses
Unrealized Appreciation	47,124		64,663
Unrealized Depreciation	(12,205)		(3,063)
Market Value	2,290,267		2,267,739
Mortgage Backed Securities: Non-agency residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	8,220		5,187
Allowance for credit losses
Unrealized Appreciation	6		9
Unrealized Depreciation	(15)		(2)
Market Value	8,211		5,194
Foreign Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,494,989		1,565,260
Allowance for credit losses			(22)	(92)	(519)
Unrealized Appreciation	80,268		102,587
Unrealized Depreciation	(21,296)		(22,450)
Market Value	1,553,961		1,645,375
Foreign Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,802,145		3,297,898
Allowance for credit losses	(1,260)	$ (205)	(503)	$ (3,492)	$ (3,950)
Unrealized Appreciation	167,015		204,023
Unrealized Depreciation	(37,763)		(29,085)
Market Value	$ 3,930,137		$ 3,472,333

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