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Investments (Summary Of Unrealized Appreciation (Depreciation) Of Available For Sale, Fixed Maturity And Equity Security Investments) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | $ 22,063,592 | $ 19,225,067 |
Allowance for credit losses | (29,738) | (1,745) |
Unrealized Appreciation | 477,548 | 941,663 |
Unrealized Depreciation | (203,130) | (124,812) |
Market Value | 22,308,272 | 20,040,173 |
Fixed Maturity Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Allowance for credit losses | (29,738) |  |
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 1,407,256 | 1,325,156 |
Allowance for credit losses |  |  |
Unrealized Appreciation | 23,720 | 49,084 |
Unrealized Depreciation | (10,358) | (7,134) |
Market Value | 1,420,618 | 1,367,106 |
Obligations Of U.S. States And Political Subdivisions [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 558,842 | 543,895 |
Allowance for credit losses | (151) |  |
Unrealized Appreciation | 29,080 | 34,654 |
Unrealized Depreciation | (1,150) | (1,254) |
Market Value | 586,621 | 577,295 |
Corporate Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 7,443,535 | 6,824,800 |
Allowance for credit losses | (19,267) | (1,220) |
Unrealized Appreciation | 195,210 | 380,677 |
Unrealized Depreciation | (62,580) | (55,231) |
Market Value | 7,556,898 | 7,149,026 |
Asset-Backed Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 3,579,439 | 2,540,809 |
Allowance for credit losses | (7,679) |  |
Unrealized Appreciation | 21,817 | 30,691 |
Unrealized Depreciation | (11,848) | (5,698) |
Market Value | 3,581,729 | 2,565,802 |
Mortgage-Backed Securities: Commercial [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 1,032,506 | 915,923 |
Allowance for credit losses |  |  |
Unrealized Appreciation | 37,550 | 75,275 |
Unrealized Depreciation | (5,690) | (895) |
Market Value | 1,064,366 | 990,303 |
Mortgage Backed Securities: Agency residential [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 2,361,208 | 2,206,139 |
Allowance for credit losses |  |  |
Unrealized Appreciation | 32,997 | 64,663 |
Unrealized Depreciation | (18,873) | (3,063) |
Market Value | 2,375,332 | 2,267,739 |
Mortgage Backed Securities: Non-agency residential [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 6,530 | 5,187 |
Allowance for credit losses |  |  |
Unrealized Appreciation | 22 | 9 |
Unrealized Depreciation | (16) | (2) |
Market Value | 6,536 | 5,194 |
Foreign Government Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 1,423,634 | 1,565,260 |
Allowance for credit losses |  | (22) |
Unrealized Appreciation | 41,957 | 102,587 |
Unrealized Depreciation | (28,079) | (22,450) |
Market Value | 1,437,512 | 1,645,375 |
Foreign Corporate Securities [Member] |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 4,250,642 | 3,297,898 |
Allowance for credit losses | (2,641) | (503) |
Unrealized Appreciation | 95,195 | 204,023 |
Unrealized Depreciation | (64,536) | (29,085) |
Market Value | $ 4,278,660 | $ 3,472,333 |

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