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Fixed Maturity Securities In An Unrealized Loss Position (Securities in an Unrealized Loss Position) (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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Debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | $ 12,344,077 | $ 8,723,575
Gross Unrealized Losses, Less than 12 Months | 813,393 | 81,947
Fair Value, 12 Months or Greater | 3,703,323 | 361,235
Gross Unrealized Losses, 12 Months or Greater | 404,571 | 42,266
Fair Value, Total | 16,047,400 | 9,084,810
Gross Unrealized Losses, Total | 1,217,964 | 124,213
U.S. government and government agency |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 578,877 | 487,712
Gross Unrealized Losses, Less than 12 Months | 63,917 | 4,026
Fair Value, 12 Months or Greater | 75,024 | 17,021
Gross Unrealized Losses, 12 Months or Greater | 4,890 | 268
Fair Value, Total | 653,901 | 504,733
Gross Unrealized Losses, Total | 68,807 | 4,294
State and municipal |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 2,158,379 | 502,333
Gross Unrealized Losses, Less than 12 Months | 139,486 | 7,403
Fair Value, 12 Months or Greater | 268,007 | 29,547
Gross Unrealized Losses, 12 Months or Greater | 45,134 | 2,156
Fair Value, Total | 2,426,386 | 531,880
Gross Unrealized Losses, Total | 184,620 | 9,559
Mortgage-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 1,260,172 | 558,751
Gross Unrealized Losses, Less than 12 Months | 117,781 | 6,900
Fair Value, 12 Months or Greater | 278,990 | 106,130
Gross Unrealized Losses, 12 Months or Greater | 62,897 | 4,762
Fair Value, Total | 1,539,162 | 664,881
Gross Unrealized Losses, Total | 180,678 | 11,662
Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 2,416,683 | 3,832,944
Gross Unrealized Losses, Less than 12 Months | 97,758 | 18,503
Fair Value, 12 Months or Greater | 1,595,161 | 75,385
Gross Unrealized Losses, 12 Months or Greater | 63,716 | 291
Fair Value, Total | 4,011,844 | 3,908,329
Gross Unrealized Losses, Total | 161,474 | 18,794
Corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 4,933,243 | 2,582,860
Gross Unrealized Losses, Less than 12 Months | 314,122 | 29,322
Fair Value, 12 Months or Greater | 1,126,858 | 51,095
Gross Unrealized Losses, 12 Months or Greater | 159,576 | 3,088
Fair Value, Total | 6,060,101 | 2,633,955
Gross Unrealized Losses, Total | 473,698 | 32,410
Foreign government |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 996,723 | 758,975
Gross Unrealized Losses, Less than 12 Months | 80,329 | 15,793
Fair Value, 12 Months or Greater | 359,283 | 82,057
Gross Unrealized Losses, 12 Months or Greater | 68,358 | 31,701
Fair Value, Total | 1,356,006 | 841,032
Gross Unrealized Losses, Total | $ 148,687 | $ 47,494

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