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Fixed Maturity Securities In An Unrealized Loss Position (Securities in an Unrealized Loss Position) (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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Debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | $ 13,439,725 | $ 8,723,575
Gross Unrealized Losses, Less than 12 Months | 691,914 | 81,947
Fair Value, 12 Months or Greater | 1,186,365 | 361,235
Gross Unrealized Losses, 12 Months or Greater | 148,291 | 42,266
Fair Value, Total | 14,626,090 | 9,084,810
Gross Unrealized Losses, Total | 840,205 | 124,213
U.S. government and government agency |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 570,441 | 487,712
Gross Unrealized Losses, Less than 12 Months | 40,355 | 4,026
Fair Value, 12 Months or Greater | 35,683 | 17,021
Gross Unrealized Losses, 12 Months or Greater | 2,559 | 268
Fair Value, Total | 606,124 | 504,733
Gross Unrealized Losses, Total | 42,914 | 4,294
State and municipal |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 1,789,266 | 502,333
Gross Unrealized Losses, Less than 12 Months | 92,972 | 7,403
Fair Value, 12 Months or Greater | 95,746 | 29,547
Gross Unrealized Losses, 12 Months or Greater | 12,315 | 2,156
Fair Value, Total | 1,885,012 | 531,880
Gross Unrealized Losses, Total | 105,287 | 9,559
Mortgage-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 1,223,393 | 558,751
Gross Unrealized Losses, Less than 12 Months | 97,556 | 6,900
Fair Value, 12 Months or Greater | 116,005 | 106,130
Gross Unrealized Losses, 12 Months or Greater | 21,263 | 4,762
Fair Value, Total | 1,339,398 | 664,881
Gross Unrealized Losses, Total | 118,819 | 11,662
Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 3,788,329 | 3,832,944
Gross Unrealized Losses, Less than 12 Months | 124,135 | 18,503
Fair Value, 12 Months or Greater | 193,620 | 75,385
Gross Unrealized Losses, 12 Months or Greater | 5,414 | 291
Fair Value, Total | 3,981,949 | 3,908,329
Gross Unrealized Losses, Total | 129,549 | 18,794
Corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 4,775,827 | 2,582,860
Gross Unrealized Losses, Less than 12 Months | 277,520 | 29,322
Fair Value, 12 Months or Greater | 499,270 | 51,095
Gross Unrealized Losses, 12 Months or Greater | 54,373 | 3,088
Fair Value, Total | 5,275,097 | 2,633,955
Gross Unrealized Losses, Total | 331,893 | 32,410
Foreign government |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 1,292,469 | 758,975
Gross Unrealized Losses, Less than 12 Months | 59,376 | 15,793
Fair Value, 12 Months or Greater | 246,041 | 82,057
Gross Unrealized Losses, 12 Months or Greater | 52,367 | 31,701
Fair Value, Total | 1,538,510 | 841,032
Gross Unrealized Losses, Total | $ 111,743 | $ 47,494

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