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Investments (Summary Of Amortized Cost And Market Value Of Fixed Maturity Securities, By Contractual Maturity) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities - available for sale, Amortized Cost | $ 22,063,592 | $ 19,225,067
Fixed maturity securities - available for sale, Market Value | 22,308,272 | 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 | 1,398,742 | 1,365,793
Fixed maturity securities - available for sale, Due after one year through five years, Amortized Cost | 7,075,077 | 6,529,189
Fixed maturity securities - available for sale, Due after five years through ten years, Amortized Cost | 5,003,792 | 4,414,211
Fixed maturity securities - available for sale, Due after ten years, Amortized Cost | 1,606,298 | 1,247,816
Fixed maturity securities - available for sale, Due in one year or less, Market Value | 1,398,006 | 1,374,674
Fixed maturity securities - available for sale, Due after one year through five years, Market Value | 7,154,468 | 6,774,785
Fixed maturity securities - available for sale, Due after five years through ten years, Market Value | 5,100,672 | 4,751,903
Fixed maturity securities - available for sale, Due after ten years, Market Value | 1,627,163 | 1,309,773
Asset-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities - available for sale, Amortized Cost | 3,579,439 | 2,540,809
Fixed maturity securities - available for sale, Market Value | 3,581,729 | 2,565,802
Mortgage-Backed Securities: Commercial [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities - available for sale, Amortized Cost | 1,032,506 | 915,923
Fixed maturity securities - available for sale, Market Value | 1,064,366 | 990,303
Mortgage Backed Securities: Agency residential [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fixed maturity securities - available for sale, Amortized Cost | 2,361,208 | 2,206,139
Fixed maturity securities - available for sale, Market Value | 2,375,332 | 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 | 6,530 | 5,187
Fixed maturity securities - available for sale, Market Value | $ 6,536 | $ 5,194

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