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Fixed Maturity Securities In An Unrealized Loss Position (Securities in an Unrealized Loss Position) (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | $ 2,652,584 | $ 5,460,931
Gross Unrealized Losses, Less than 12 Months | 43,295 | 82,882
Fair Value, 12 Months or Greater | 5,064,620 | 7,086,937
Gross Unrealized Losses, 12 Months or Greater | 457,383 | 625,846
Fair Value, Total | 7,717,204 | 12,547,868
Gross Unrealized Losses, Total | 500,678 | 708,728
U.S. government and government agency |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 797,397 | 767,515
Gross Unrealized Losses, Less than 12 Months | 9,950 | 9,637
Fair Value, 12 Months or Greater | 261,701 | 560,260
Gross Unrealized Losses, 12 Months or Greater | 9,729 | 33,226
Fair Value, Total | 1,059,098 | 1,327,775
Gross Unrealized Losses, Total | 19,679 | 42,863
State and municipal |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 124,377 | 348,116
Gross Unrealized Losses, Less than 12 Months | 1,781 | 8,027
Fair Value, 12 Months or Greater | 1,129,946 | 1,411,761
Gross Unrealized Losses, 12 Months or Greater | 42,313 | 81,430
Fair Value, Total | 1,254,323 | 1,759,877
Gross Unrealized Losses, Total | 44,094 | 89,457
Mortgage-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 639,327 | 1,541,464
Gross Unrealized Losses, Less than 12 Months | 5,456 | 21,326
Fair Value, 12 Months or Greater | 948,076 | 1,060,823
Gross Unrealized Losses, 12 Months or Greater | 134,882 | 171,734
Fair Value, Total | 1,587,403 | 2,602,287
Gross Unrealized Losses, Total | 140,338 | 193,060
Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 428,088 | 411,763
Gross Unrealized Losses, Less than 12 Months | 1,515 | 4,613
Fair Value, 12 Months or Greater | 550,779 | 626,237
Gross Unrealized Losses, 12 Months or Greater | 18,713 | 36,899
Fair Value, Total | 978,867 | 1,038,000
Gross Unrealized Losses, Total | 20,228 | 41,512
Corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 434,595 | 1,791,970
Gross Unrealized Losses, Less than 12 Months | 3,389 | 21,346
Fair Value, 12 Months or Greater | 1,841,143 | 2,951,377
Gross Unrealized Losses, 12 Months or Greater | 67,888 | 135,117
Fair Value, Total | 2,275,738 | 4,743,347
Gross Unrealized Losses, Total | 71,277 | 156,463
Foreign government |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 228,800 | 600,103
Gross Unrealized Losses, Less than 12 Months | 21,204 | 17,933
Fair Value, 12 Months or Greater | 332,975 | 476,479
Gross Unrealized Losses, 12 Months or Greater | 183,858 | 167,440
Fair Value, Total | 561,775 | 1,076,582
Gross Unrealized Losses, Total | $ 205,062 | $ 185,373

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