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Investments (Summary Of Unrealized Appreciation (Depreciation) Of Available For Sale, Fixed Maturity And Equity Security Investments) (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Amortized Cost | $ 23,408,417 |  | $ 22,063,592 |  |  |
Allowance for credit losses | (42,714) | $ (41,591) | (29,738) | $ (24,650) | $ (8,723) | $ (1,745)
Fixed maturity securities - available for sale | 21,880,443 |  | 22,308,272 |  |  |
Fixed Maturity Securities [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Amortized Cost | 23,408,417 |  | 22,063,592 |  |  |
Allowance for credit losses | (42,714) |  | (29,738) |  |  |
Unrealized Appreciation | 80,333 |  | 477,548 |  |  |
Unrealized Depreciation | (1,565,593) |  | (203,130) |  |  |
Fixed maturity securities - available for sale | 21,880,443 |  | 22,308,272 |  |  |
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Amortized Cost | 1,385,608 |  | 1,407,256 |  |  |
Allowance for credit losses |  |  |  |  |  |
Unrealized Appreciation | 7,193 |  | 23,720 |  |  |
Unrealized Depreciation | (54,571) |  | (10,358) |  |  |
Fixed maturity securities - available for sale | 1,338,230 |  | 1,420,618 |  |  |
Obligations Of U.S. States And Political Subdivisions [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Amortized Cost | 528,830 |  | 558,842 |  |  |
Allowance for credit losses | (151) | (151) | (151) |  |  |
Unrealized Appreciation | 3,950 |  | 29,080 |  |  |
Unrealized Depreciation | (24,348) |  | (1,150) |  |  |
Fixed maturity securities - available for sale | 508,281 |  | 586,621 |  |  |
Corporate Securities [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Amortized Cost | 7,505,558 |  | 7,443,535 |  |  |
Allowance for credit losses | (25,583) | (20,049) | (19,267) | (18,475) | (3,603) | (1,220)
Unrealized Appreciation | 31,650 |  | 195,210 |  |  |
Unrealized Depreciation | (524,848) |  | (62,580) |  |  |
Fixed maturity securities - available for sale | 6,986,777 |  | 7,556,898 |  |  |
Asset-Backed Securities [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Amortized Cost | 4,081,011 |  | 3,579,439 |  |  |
Allowance for credit losses |  | (7,679) | (7,679) | (4,915) | (4,915) |
Unrealized Appreciation | 909 |  | 21,817 |  |  |
Unrealized Depreciation | (183,241) |  | (11,848) |  |  |
Fixed maturity securities - available for sale | 3,898,679 |  | 3,581,729 |  |  |
Mortgage-Backed Securities: Commercial [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Amortized Cost | 1,024,591 |  | 1,032,506 |  |  |
Allowance for credit losses |  |  |  |  |  |
Unrealized Appreciation | 124 |  | 37,550 |  |  |
Unrealized Depreciation | (72,820) |  | (5,690) |  |  |
Fixed maturity securities - available for sale | 951,895 |  | 1,064,366 |  |  |
Mortgage Backed Securities: Agency residential [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Amortized Cost | 2,874,574 |  | 2,361,208 |  |  |
Allowance for credit losses |  |  |  |  |  |
Unrealized Appreciation | 2,937 |  | 32,997 |  |  |
Unrealized Depreciation | (186,656) |  | (18,873) |  |  |
Fixed maturity securities - available for sale | 2,690,855 |  | 2,375,332 |  |  |
Mortgage Backed Securities: Non-agency residential [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Amortized Cost | 5,349 |  | 6,530 |  |  |
Allowance for credit losses |  |  |  |  |  |
Unrealized Appreciation |  |  | 22 |  |  |
Unrealized Depreciation | (208) |  | (16) |  |  |
Fixed maturity securities - available for sale | 5,141 |  | 6,536 |  |  |
Foreign Government Securities [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Amortized Cost | 1,463,494 |  | 1,423,634 |  |  |
Allowance for credit losses |  |  |  |  |  | (22)
Unrealized Appreciation | 11,670 |  | 41,957 |  |  |
Unrealized Depreciation | (115,421) |  | (28,079) |  |  |
Fixed maturity securities - available for sale | 1,359,743 |  | 1,437,512 |  |  |
Foreign Corporate Securities [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Amortized Cost | 4,539,402 |  | 4,250,642 |  |  |
Allowance for credit losses | (16,980) | $ (13,712) | (2,641) | $ (1,260) | $ (205) | $ (503)
Unrealized Appreciation | 21,900 |  | 95,195 |  |  |
Unrealized Depreciation | (403,480) |  | (64,536) |  |  |
Fixed maturity securities - available for sale | $ 4,140,842 |  | $ 4,278,660 |  |  |

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