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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, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Amortized Cost | $ 20,718,717 |  |  |  |  |
Allowance for credit losses | (24,650) | $ (8,723) | $ (1,745) | $ (25,837) | $ (21,774) |
Fixed Maturity Securities [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Amortized Cost | 20,718,717 |  | 19,225,067 |  |  |
Allowance for credit losses | (24,650) |  | (1,745) |  |  |
Unrealized Appreciation | 735,661 |  | 941,663 |  |  |
Unrealized Depreciation | (154,529) |  | (124,812) |  |  |
Market Value | 21,275,199 |  | 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 | 1,259,149 |  | 1,325,156 |  |  |
Allowance for credit losses |  |  |  |  |  |
Unrealized Appreciation | 29,365 |  | 49,084 |  |  |
Unrealized Depreciation | (12,756) |  | (7,134) |  |  |
Market Value | 1,275,758 |  | 1,367,106 |  |  |
Obligations Of U.S. States And Political Subdivisions [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Amortized Cost | 574,398 |  | 543,895 |  |  |
Allowance for credit losses |  |  |  |  |  |
Unrealized Appreciation | 35,933 |  | 34,654 |  |  |
Unrealized Depreciation | (986) |  | (1,254) |  |  |
Market Value | 609,345 |  | 577,295 |  |  |
Corporate Securities [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Amortized Cost | 7,155,688 |  | 6,824,800 |  |  |
Allowance for credit losses | (18,475) | (3,603) | (1,220) | (22,253) | (17,305) |
Unrealized Appreciation | 285,509 |  | 380,677 |  |  |
Unrealized Depreciation | (63,018) |  | (55,231) |  |  |
Market Value | 7,359,704 |  | 7,149,026 |  |  |
Asset-Backed Securities [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Amortized Cost | 3,141,971 |  | 2,540,809 |  |  |
Allowance for credit losses | (4,915) | (4,915) |  |  |  |
Unrealized Appreciation | 35,316 |  | 30,691 |  |  |
Unrealized Depreciation | (2,955) |  | (5,698) |  |  |
Market Value | 3,169,417 |  | 2,565,802 |  |  |
Mortgage-Backed Securities: Commercial [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Amortized Cost | 1,026,809 |  | 915,923 |  |  |
Allowance for credit losses |  |  |  |  |  |
Unrealized Appreciation | 55,125 |  | 75,275 |  |  |
Unrealized Depreciation | (3,535) |  | (895) |  |  |
Market Value | 1,078,399 |  | 990,303 |  |  |
Mortgage Backed Securities: Agency residential [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Amortized Cost | 2,255,348 |  | 2,206,139 |  |  |
Allowance for credit losses |  |  |  |  |  |
Unrealized Appreciation | 47,124 |  | 64,663 |  |  |
Unrealized Depreciation | (12,205) |  | (3,063) |  |  |
Market Value | 2,290,267 |  | 2,267,739 |  |  |
Mortgage Backed Securities: Non-agency residential [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Amortized Cost | 8,220 |  | 5,187 |  |  |
Allowance for credit losses |  |  |  |  |  |
Unrealized Appreciation | 6 |  | 9 |  |  |
Unrealized Depreciation | (15) |  | (2) |  |  |
Market Value | 8,211 |  | 5,194 |  |  |
Foreign Government Securities [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Amortized Cost | 1,494,989 |  | 1,565,260 |  |  |
Allowance for credit losses |  |  | (22) | (92) | (519) |
Unrealized Appreciation | 80,268 |  | 102,587 |  |  |
Unrealized Depreciation | (21,296) |  | (22,450) |  |  |
Market Value | 1,553,961 |  | 1,645,375 |  |  |
Foreign Corporate Securities [Member] |  |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |  |
Amortized Cost | 3,802,145 |  | 3,297,898 |  |  |
Allowance for credit losses | (1,260) | $ (205) | (503) | $ (3,492) | $ (3,950) |
Unrealized Appreciation | 167,015 |  | 204,023 |  |  |
Unrealized Depreciation | (37,763) |  | (29,085) |  |  |
Market Value | $ 3,930,137 |  | $ 3,472,333 |  |  |

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