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Investments (Summary Of Unrealized Appreciation (Depreciation) Of Available For Sale, Fixed Maturity And Equity Security Investments) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 21,182,756		$ 19,225,067
Allowance for credit losses	(31,980)	$ (24,650)	(1,745)	$ (19,641)	$ (25,837)
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	21,182,756		19,225,067
Allowance for credit losses	(31,980)		(1,745)
Unrealized Appreciation	626,445		941,663
Unrealized Depreciation	(154,102)		(124,812)
Market Value	21,623,119		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	1,344,813		1,325,156
Allowance for credit losses
Unrealized Appreciation	28,332		49,084
Unrealized Depreciation	(10,323)		(7,134)
Market Value	1,362,822		1,367,106
Obligations Of U.S. States And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	578,289		543,895
Allowance for credit losses	(151)
Unrealized Appreciation	31,295		34,654
Unrealized Depreciation	(1,058)		(1,254)
Market Value	608,375		577,295
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,315,144		6,824,800
Allowance for credit losses	(22,890)	(18,475)	(1,220)	(17,474)	(22,253)
Unrealized Appreciation	254,723		380,677
Unrealized Depreciation	(52,736)		(55,231)
Market Value	7,494,241		7,149,026
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,284,025		2,540,809
Allowance for credit losses	(7,679)	(4,915)
Unrealized Appreciation	32,405		30,691
Unrealized Depreciation	(3,499)		(5,698)
Market Value	3,305,252		2,565,802
Mortgage-Backed Securities: Commercial [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,042,504		915,923
Allowance for credit losses
Unrealized Appreciation	49,729		75,275
Unrealized Depreciation	(4,363)		(895)
Market Value	1,087,870		990,303
Mortgage Backed Securities: Agency residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,208,540		2,206,139
Allowance for credit losses
Unrealized Appreciation	45,876		64,663
Unrealized Depreciation	(8,415)		(3,063)
Market Value	2,246,001		2,267,739
Mortgage Backed Securities: Non-agency residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,316		5,187
Allowance for credit losses
Unrealized Appreciation	11		9
Unrealized Depreciation	(21)		(2)
Market Value	7,306		5,194
Foreign Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,428,105		1,565,260
Allowance for credit losses			(22)	(119)	(92)
Unrealized Appreciation	54,778		102,587
Unrealized Depreciation	(27,738)		(22,450)
Market Value	1,455,145		1,645,375
Foreign Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,974,020		3,297,898
Allowance for credit losses	(1,260)	$ (1,260)	(503)	$ (2,048)	$ (3,492)
Unrealized Appreciation	129,296		204,023
Unrealized Depreciation	(45,949)		(29,085)
Market Value	$ 4,056,107		$ 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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