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Fixed Maturity Securities In An Unrealized Loss Position (Securities in an Unrealized Loss Position) (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
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Debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, Less than 12 months | $ 4,890,221 | $ 2,420,657
Gross Unrealized Losses, Less than 12 Months | 50,371 | 27,496
Fair Value, 12 Months or Greater | 10,083,279 | 11,043,923
Gross Unrealized Losses, 12 Months or Greater | 806,572 | 783,679
Fair Value, Total | 14,973,500 | 13,464,580
Gross Unrealized Losses, Total | 856,943 | 811,175
U.S. government and government agency |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, Less than 12 months | 422,945 | 384,392
Gross Unrealized Losses, Less than 12 Months | 3,391 | 6,655
Fair Value, 12 Months or Greater | 795,297 | 614,623
Gross Unrealized Losses, 12 Months or Greater | 51,081 | 51,014
Fair Value, Total | 1,218,242 | 999,015
Gross Unrealized Losses, Total | 54,472 | 57,669
State and municipal |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, Less than 12 months | 357,529 | 264,273
Gross Unrealized Losses, Less than 12 Months | 4,935 | 3,013
Fair Value, 12 Months or Greater | 1,758,572 | 1,680,034
Gross Unrealized Losses, 12 Months or Greater | 114,831 | 119,449
Fair Value, Total | 2,116,101 | 1,944,307
Gross Unrealized Losses, Total | 119,766 | 122,462
Mortgage-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, Less than 12 months | 530,802 | 278,819
Gross Unrealized Losses, Less than 12 Months | 4,258 | 2,025
Fair Value, 12 Months or Greater | 1,356,573 | 1,360,748
Gross Unrealized Losses, 12 Months or Greater | 182,908 | 175,131
Fair Value, Total | 1,887,375 | 1,639,567
Gross Unrealized Losses, Total | 187,166 | 177,156
Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, Less than 12 months | 947,780 | 413,511
Gross Unrealized Losses, Less than 12 Months | 4,434 | 2,070
Fair Value, 12 Months or Greater | 1,079,695 | 2,176,035
Gross Unrealized Losses, 12 Months or Greater | 57,188 | 71,136
Fair Value, Total | 2,027,475 | 2,589,546
Gross Unrealized Losses, Total | 61,622 | 73,206
Corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, Less than 12 months | 2,068,015 | 874,754
Gross Unrealized Losses, Less than 12 Months | 17,788 | 11,975
Fair Value, 12 Months or Greater | 4,333,968 | 4,418,309
Gross Unrealized Losses, 12 Months or Greater | 222,444 | 231,288
Fair Value, Total | 6,401,983 | 5,293,063
Gross Unrealized Losses, Total | 240,232 | 243,263
Foreign government |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair value, Less than 12 months | 563,150 | 204,908
Gross Unrealized Losses, Less than 12 Months | 15,565 | 1,758
Fair Value, 12 Months or Greater | 759,174 | 794,174
Gross Unrealized Losses, 12 Months or Greater | 178,120 | 135,661
Fair Value, Total | 1,322,324 | 999,082
Gross Unrealized Losses, Total | $ 193,685 | $ 137,419

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