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Investments (Summary Of Unrealized Appreciation (Depreciation) Of Available For Sale, Fixed Maturity And Equity Security Investments) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 19,932,190
Allowance for credit losses	(8,723)	$ (1,745)	$ (21,774)
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	19,932,190	19,225,067
Allowance for credit losses	(8,723)	(1,745)
Unrealized Appreciation	677,466	941,663
Unrealized Depreciation	(193,453)	(124,812)
Market Value	20,407,480	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	1,271,760	1,325,156
Allowance for credit losses
Unrealized Appreciation	33,703	49,084
Unrealized Depreciation	(11,537)	(7,134)
Market Value	1,293,926	1,367,106
Obligations Of U.S. States And Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	566,698	543,895
Allowance for credit losses
Unrealized Appreciation	32,092	34,654
Unrealized Depreciation	(2,741)	(1,254)
Market Value	596,049	577,295
Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,228,229	6,824,800
Allowance for credit losses	(3,603)	(1,220)	(17,305)
Unrealized Appreciation	255,940	380,677
Unrealized Depreciation	(85,555)	(55,231)
Market Value	7,395,011	7,149,026
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,615,962	2,540,809
Allowance for credit losses	(4,915)
Unrealized Appreciation	27,486	30,691
Unrealized Depreciation	(2,762)	(5,698)
Market Value	2,635,771	2,565,802
Commercial Mortgage-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	992,442	915,923
Allowance for credit losses
Unrealized Appreciation	43,127	75,275
Unrealized Depreciation	(6,252)	(895)
Market Value	1,029,317	990,303
Agency residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	2,257,474	2,206,139
Allowance for credit losses
Unrealized Appreciation	56,223	64,663
Unrealized Depreciation	(14,724)	(3,063)
Market Value	2,298,973	2,267,739
Non-agency residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	9,253	5,187
Allowance for credit losses
Unrealized Appreciation	4	9
Unrealized Depreciation	(12)	(2)
Market Value	9,245	5,194
Foreign Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	1,556,644	1,565,260
Allowance for credit losses		(22)	(519)
Unrealized Appreciation	74,746	102,587
Unrealized Depreciation	(27,160)	(22,450)
Market Value	1,604,230	1,645,375
Foreign Corporate Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	3,433,728	3,297,898
Allowance for credit losses	(205)	(503)	$ (3,950)
Unrealized Appreciation	154,145	204,023
Unrealized Depreciation	(42,710)	(29,085)
Market Value	$ 3,544,958	$ 3,472,333

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