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Investments (Summary Of Amortized Cost And Market Value Of Fixed Maturity Securities, By Contractual Maturity) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	$ 20,718,717	$ 19,225,067
Fixed maturity securities - available for sale, Market Value	21,275,199	20,040,173
Fixed Maturity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Due in one year or less, Amortized Cost	1,628,113	1,365,793
Fixed maturity securities - available for sale, Due after one year through five years, Amortized Cost	6,432,847	6,529,189
Fixed maturity securities - available for sale, Due after five years through ten years, Amortized Cost	4,890,259	4,414,211
Fixed maturity securities - available for sale, Due after ten years, Amortized Cost	1,335,150	1,247,816
Fixed maturity securities - available for sale, Due in one year or less, Market Value	1,638,768	1,374,674
Fixed maturity securities - available for sale, Due after one year through five years, Market Value	6,618,429	6,774,785
Fixed maturity securities - available for sale, Due after five years through ten years, Market Value	5,091,435	4,751,903
Fixed maturity securities - available for sale, Due after ten years, Market Value	1,380,273	1,309,773
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	3,141,971	2,540,809
Fixed maturity securities - available for sale, Market Value	3,169,417	2,565,802
Mortgage-Backed Securities: Commercial [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	1,026,809	915,923
Fixed maturity securities - available for sale, Market Value	1,078,399	990,303
Mortgage Backed Securities: Agency residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	2,255,348	2,206,139
Fixed maturity securities - available for sale, Market Value	2,290,267	2,267,739
Mortgage Backed Securities: Non-agency residential [Member]
Schedule of Available-for-sale Securities [Line Items]
Fixed maturity securities - available for sale, Amortized Cost	8,220	5,187
Fixed maturity securities - available for sale, Market Value	$ 8,211	$ 5,194

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