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Investments (Summary Of Unrealized Appreciation (Depreciation) Of Available For Sale, Fixed Maturity And Equity Security Investments) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | $ 19,932,190 |  |  |
Allowance for credit losses | (8,723) | $ (1,745) | $ (21,774) |
Fixed Maturity Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 19,932,190 | 19,225,067 |  |
Allowance for credit losses | (8,723) | (1,745) |  |
Unrealized Appreciation | 677,466 | 941,663 |  |
Unrealized Depreciation | (193,453) | (124,812) |  |
Market Value | 20,407,480 | 20,040,173 |  |
U.S. Treasury Securities And Obligations Of U.S. Government Agencies And Corporations [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 1,271,760 | 1,325,156 |  |
Allowance for credit losses |  |  |  |
Unrealized Appreciation | 33,703 | 49,084 |  |
Unrealized Depreciation | (11,537) | (7,134) |  |
Market Value | 1,293,926 | 1,367,106 |  |
Obligations Of U.S. States And Political Subdivisions [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 566,698 | 543,895 |  |
Allowance for credit losses |  |  |  |
Unrealized Appreciation | 32,092 | 34,654 |  |
Unrealized Depreciation | (2,741) | (1,254) |  |
Market Value | 596,049 | 577,295 |  |
Corporate Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 7,228,229 | 6,824,800 |  |
Allowance for credit losses | (3,603) | (1,220) | (17,305) |
Unrealized Appreciation | 255,940 | 380,677 |  |
Unrealized Depreciation | (85,555) | (55,231) |  |
Market Value | 7,395,011 | 7,149,026 |  |
Asset-Backed Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 2,615,962 | 2,540,809 |  |
Allowance for credit losses | (4,915) |  |  |
Unrealized Appreciation | 27,486 | 30,691 |  |
Unrealized Depreciation | (2,762) | (5,698) |  |
Market Value | 2,635,771 | 2,565,802 |  |
Commercial Mortgage-Backed Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 992,442 | 915,923 |  |
Allowance for credit losses |  |  |  |
Unrealized Appreciation | 43,127 | 75,275 |  |
Unrealized Depreciation | (6,252) | (895) |  |
Market Value | 1,029,317 | 990,303 |  |
Agency residential [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 2,257,474 | 2,206,139 |  |
Allowance for credit losses |  |  |  |
Unrealized Appreciation | 56,223 | 64,663 |  |
Unrealized Depreciation | (14,724) | (3,063) |  |
Market Value | 2,298,973 | 2,267,739 |  |
Non-agency residential [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 9,253 | 5,187 |  |
Allowance for credit losses |  |  |  |
Unrealized Appreciation | 4 | 9 |  |
Unrealized Depreciation | (12) | (2) |  |
Market Value | 9,245 | 5,194 |  |
Foreign Government Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 1,556,644 | 1,565,260 |  |
Allowance for credit losses |  | (22) | (519) |
Unrealized Appreciation | 74,746 | 102,587 |  |
Unrealized Depreciation | (27,160) | (22,450) |  |
Market Value | 1,604,230 | 1,645,375 |  |
Foreign Corporate Securities [Member] |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |
Amortized Cost | 3,433,728 | 3,297,898 |  |
Allowance for credit losses | (205) | (503) | $ (3,950) |
Unrealized Appreciation | 154,145 | 204,023 |  |
Unrealized Depreciation | (42,710) | (29,085) |  |
Market Value | $ 3,544,958 | $ 3,472,333 |  |

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