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Fixed Maturity Securities In An Unrealized Loss Position (Securities in an Unrealized Loss Position) (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
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Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | $ 3,129,765 | $ 5,460,931
Gross Unrealized Losses, Less than 12 Months | 33,678 | 82,882
Fair Value, 12 Months or Greater | 5,697,092 | 7,086,937
Gross Unrealized Losses, 12 Months or Greater | 487,982 | 625,846
Fair Value, Total | 8,826,857 | 12,547,868
Gross Unrealized Losses, Total | 521,660 | 708,728
U.S. government and government agency |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 941,906 | 767,515
Gross Unrealized Losses, Less than 12 Months | 11,134 | 9,637
Fair Value, 12 Months or Greater | 466,439 | 560,260
Gross Unrealized Losses, 12 Months or Greater | 19,315 | 33,226
Fair Value, Total | 1,408,345 | 1,327,775
Gross Unrealized Losses, Total | 30,449 | 42,863
State and municipal |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 200,033 | 348,116
Gross Unrealized Losses, Less than 12 Months | 3,908 | 8,027
Fair Value, 12 Months or Greater | 1,262,830 | 1,411,761
Gross Unrealized Losses, 12 Months or Greater | 51,312 | 81,430
Fair Value, Total | 1,462,863 | 1,759,877
Gross Unrealized Losses, Total | 55,220 | 89,457
Mortgage-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 859,569 | 1,541,464
Gross Unrealized Losses, Less than 12 Months | 11,556 | 21,326
Fair Value, 12 Months or Greater | 887,676 | 1,060,823
Gross Unrealized Losses, 12 Months or Greater | 146,042 | 171,734
Fair Value, Total | 1,747,245 | 2,602,287
Gross Unrealized Losses, Total | 157,598 | 193,060
Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 610,864 | 411,763
Gross Unrealized Losses, Less than 12 Months | 2,675 | 4,613
Fair Value, 12 Months or Greater | 532,828 | 626,237
Gross Unrealized Losses, 12 Months or Greater | 24,130 | 36,899
Fair Value, Total | 1,143,692 | 1,038,000
Gross Unrealized Losses, Total | 26,805 | 41,512
Corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 366,889 | 1,791,970
Gross Unrealized Losses, Less than 12 Months | 2,120 | 21,346
Fair Value, 12 Months or Greater | 2,207,465 | 2,951,377
Gross Unrealized Losses, 12 Months or Greater | 83,962 | 135,117
Fair Value, Total | 2,574,354 | 4,743,347
Gross Unrealized Losses, Total | 86,082 | 156,463
Foreign government |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 150,504 | 600,103
Gross Unrealized Losses, Less than 12 Months | 2,285 | 17,933
Fair Value, 12 Months or Greater | 339,854 | 476,479
Gross Unrealized Losses, 12 Months or Greater | 163,221 | 167,440
Fair Value, Total | 490,358 | 1,076,582
Gross Unrealized Losses, Total | $ 165,506 | $ 185,373

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