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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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