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Fixed Maturity Securities In An Unrealized Loss Position (Securities in an Unrealized Loss Position) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | $ 3,946,235 | $ 2,420,657
Gross Unrealized Losses, Less than 12 Months | 40,721 | 27,496
Fair Value, 12 Months or Greater | 10,214,690 | 11,043,923
Gross Unrealized Losses, 12 Months or Greater | 820,320 | 783,679
Fair Value, Total | 14,160,925 | 13,464,580
Gross Unrealized Losses, Total | 861,041 | 811,175
U.S. government and government agency |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 439,699 | 384,392
Gross Unrealized Losses, Less than 12 Months | 6,725 | 6,655
Fair Value, 12 Months or Greater | 666,947 | 614,623
Gross Unrealized Losses, 12 Months or Greater | 48,531 | 51,014
Fair Value, Total | 1,106,646 | 999,015
Gross Unrealized Losses, Total | 55,256 | 57,669
State and municipal |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 308,609 | 264,273
Gross Unrealized Losses, Less than 12 Months | 3,376 | 3,013
Fair Value, 12 Months or Greater | 1,764,296 | 1,680,034
Gross Unrealized Losses, 12 Months or Greater | 120,513 | 119,449
Fair Value, Total | 2,072,905 | 1,944,307
Gross Unrealized Losses, Total | 123,889 | 122,462
Mortgage-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 288,696 | 278,819
Gross Unrealized Losses, Less than 12 Months | 5,023 | 2,025
Fair Value, 12 Months or Greater | 1,374,227 | 1,360,748
Gross Unrealized Losses, 12 Months or Greater | 189,936 | 175,131
Fair Value, Total | 1,662,923 | 1,639,567
Gross Unrealized Losses, Total | 194,959 | 177,156
Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 1,055,695 | 413,511
Gross Unrealized Losses, Less than 12 Months | 3,765 | 2,070
Fair Value, 12 Months or Greater | 1,282,145 | 2,176,035
Gross Unrealized Losses, 12 Months or Greater | 60,820 | 71,136
Fair Value, Total | 2,337,840 | 2,589,546
Gross Unrealized Losses, Total | 64,585 | 73,206
Corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 1,532,300 | 874,754
Gross Unrealized Losses, Less than 12 Months | 16,754 | 11,975
Fair Value, 12 Months or Greater | 4,372,753 | 4,418,309
Gross Unrealized Losses, 12 Months or Greater | 231,251 | 231,288
Fair Value, Total | 5,905,053 | 5,293,063
Gross Unrealized Losses, Total | 248,005 | 243,263
Foreign government |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 321,236 | 204,908
Gross Unrealized Losses, Less than 12 Months | 5,078 | 1,758
Fair Value, 12 Months or Greater | 754,322 | 794,174
Gross Unrealized Losses, 12 Months or Greater | 169,269 | 135,661
Fair Value, Total | 1,075,558 | 999,082
Gross Unrealized Losses, Total | $ 174,347 | $ 137,419

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