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Fixed Maturity Securities In An Unrealized Loss Position (Securities in an Unrealized Loss Position) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | $ 5,621,577 | $ 8,843,558
Gross Unrealized Losses, Less than 12 Months | 120,273 | 403,241
Fair Value, 12 Months or Greater | 11,676,271 | 6,763,340
Gross Unrealized Losses, 12 Months or Greater | 1,047,729 | 719,593
Fair Value, Total | 17,297,848 | 15,606,898
Gross Unrealized Losses, Total | 1,168,002 | 1,122,834
U.S. government and government agency |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 605,944 | 285,391
Gross Unrealized Losses, Less than 12 Months | 17,390 | 10,219
Fair Value, 12 Months or Greater | 592,215 | 453,520
Gross Unrealized Losses, 12 Months or Greater | 64,377 | 58,939
Fair Value, Total | 1,198,159 | 738,911
Gross Unrealized Losses, Total | 81,767 | 69,158
State and municipal |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 645,642 | 1,720,443
Gross Unrealized Losses, Less than 12 Months | 15,255 | 89,272
Fair Value, 12 Months or Greater | 1,728,892 | 598,797
Gross Unrealized Losses, 12 Months or Greater | 167,938 | 79,320
Fair Value, Total | 2,374,534 | 2,319,240
Gross Unrealized Losses, Total | 183,193 | 168,592
Mortgage-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 688,848 | 1,099,549
Gross Unrealized Losses, Less than 12 Months | 17,058 | 75,430
Fair Value, 12 Months or Greater | 1,296,384 | 473,318
Gross Unrealized Losses, 12 Months or Greater | 217,712 | 115,528
Fair Value, Total | 1,985,232 | 1,572,867
Gross Unrealized Losses, Total | 234,770 | 190,958
Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 1,025,656 | 1,569,647
Gross Unrealized Losses, Less than 12 Months | 8,774 | 48,390
Fair Value, 12 Months or Greater | 2,584,224 | 2,176,638
Gross Unrealized Losses, 12 Months or Greater | 100,251 | 103,932
Fair Value, Total | 3,609,880 | 3,746,285
Gross Unrealized Losses, Total | 109,025 | 152,322
Corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 2,091,830 | 3,690,856
Gross Unrealized Losses, Less than 12 Months | 46,758 | 150,115
Fair Value, 12 Months or Greater | 4,695,101 | 2,349,281
Gross Unrealized Losses, 12 Months or Greater | 362,901 | 256,631
Fair Value, Total | 6,786,931 | 6,040,137
Gross Unrealized Losses, Total | 409,659 | 406,746
Foreign government |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 563,657 | 477,672
Gross Unrealized Losses, Less than 12 Months | 15,038 | 29,815
Fair Value, 12 Months or Greater | 779,455 | 711,786
Gross Unrealized Losses, 12 Months or Greater | 134,550 | 105,243
Fair Value, Total | 1,343,112 | 1,189,458
Gross Unrealized Losses, Total | $ 149,588 | $ 135,058

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