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Fixed Maturity Securities In An Unrealized Loss Position (Securities in an Unrealized Loss Position) (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
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Debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | $ 5,444,113 | $ 8,843,558
Gross Unrealized Losses, Less than 12 Months | 129,539 | 403,241
Fair Value, 12 Months or Greater | 10,536,805 | 6,763,340
Gross Unrealized Losses, 12 Months or Greater | 899,714 | 719,593
Fair Value, Total | 15,980,918 | 15,606,898
Gross Unrealized Losses, Total | 1,029,253 | 1,122,834
U.S. government and government agency |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 450,681 | 285,391
Gross Unrealized Losses, Less than 12 Months | 8,273 | 10,219
Fair Value, 12 Months or Greater | 554,499 | 453,520
Gross Unrealized Losses, 12 Months or Greater | 62,453 | 58,939
Fair Value, Total | 1,005,180 | 738,911
Gross Unrealized Losses, Total | 70,726 | 69,158
State and municipal |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 813,039 | 1,720,443
Gross Unrealized Losses, Less than 12 Months | 14,144 | 89,272
Fair Value, 12 Months or Greater | 1,397,956 | 598,797
Gross Unrealized Losses, 12 Months or Greater | 130,851 | 79,320
Fair Value, Total | 2,210,995 | 2,319,240
Gross Unrealized Losses, Total | 144,995 | 168,592
Mortgage-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 616,445 | 1,099,549
Gross Unrealized Losses, Less than 12 Months | 14,056 | 75,430
Fair Value, 12 Months or Greater | 1,136,423 | 473,318
Gross Unrealized Losses, 12 Months or Greater | 175,973 | 115,528
Fair Value, Total | 1,752,868 | 1,572,867
Gross Unrealized Losses, Total | 190,029 | 190,958
Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 779,215 | 1,569,647
Gross Unrealized Losses, Less than 12 Months | 7,721 | 48,390
Fair Value, 12 Months or Greater | 2,627,475 | 2,176,638
Gross Unrealized Losses, 12 Months or Greater | 108,315 | 103,932
Fair Value, Total | 3,406,690 | 3,746,285
Gross Unrealized Losses, Total | 116,036 | 152,322
Corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 2,378,238 | 3,690,856
Gross Unrealized Losses, Less than 12 Months | 55,011 | 150,115
Fair Value, 12 Months or Greater | 3,985,296 | 2,349,281
Gross Unrealized Losses, 12 Months or Greater | 323,373 | 256,631
Fair Value, Total | 6,363,534 | 6,040,137
Gross Unrealized Losses, Total | 378,384 | 406,746
Foreign government |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 406,495 | 477,672
Gross Unrealized Losses, Less than 12 Months | 30,334 | 29,815
Fair Value, 12 Months or Greater | 835,156 | 711,786
Gross Unrealized Losses, 12 Months or Greater | 98,749 | 105,243
Fair Value, Total | 1,241,651 | 1,189,458
Gross Unrealized Losses, Total | $ 129,083 | $ 135,058

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