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Fixed Maturity Securities In An Unrealized Loss Position (Securities in an Unrealized Loss Position) (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | $ 11,489,692 | $ 8,723,575
Gross Unrealized Losses, Less than 12 Months | 359,191 | 81,947
Fair Value, 12 Months or Greater | 1,052,185 | 361,235
Gross Unrealized Losses, 12 Months or Greater | 94,775 | 42,266
Fair Value, Total | 12,541,877 | 9,084,810
Gross Unrealized Losses, Total | 453,966 | 124,213
U.S. government and government agency |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 547,027 | 487,712
Gross Unrealized Losses, Less than 12 Months | 18,521 | 4,026
Fair Value, 12 Months or Greater | 36,307 | 17,021
Gross Unrealized Losses, 12 Months or Greater | 2,195 | 268
Fair Value, Total | 583,334 | 504,733
Gross Unrealized Losses, Total | 20,716 | 4,294
State and municipal |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 1,360,055 | 502,333
Gross Unrealized Losses, Less than 12 Months | 51,579 | 7,403
Fair Value, 12 Months or Greater | 95,853 | 29,547
Gross Unrealized Losses, 12 Months or Greater | 9,345 | 2,156
Fair Value, Total | 1,455,908 | 531,880
Gross Unrealized Losses, Total | 60,924 | 9,559
Mortgage-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 1,069,979 | 558,751
Gross Unrealized Losses, Less than 12 Months | 49,408 | 6,900
Fair Value, 12 Months or Greater | 140,480 | 106,130
Gross Unrealized Losses, 12 Months or Greater | 15,001 | 4,762
Fair Value, Total | 1,210,459 | 664,881
Gross Unrealized Losses, Total | 64,409 | 11,662
Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 3,898,607 | 3,832,944
Gross Unrealized Losses, Less than 12 Months | 61,254 | 18,503
Fair Value, 12 Months or Greater | 186,663 | 75,385
Gross Unrealized Losses, 12 Months or Greater | 2,319 | 291
Fair Value, Total | 4,085,270 | 3,908,329
Gross Unrealized Losses, Total | 63,573 | 18,794
Corporate |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 3,805,020 | 2,582,860
Gross Unrealized Losses, Less than 12 Months | 148,708 | 29,322
Fair Value, 12 Months or Greater | 381,306 | 51,095
Gross Unrealized Losses, 12 Months or Greater | 31,823 | 3,088
Fair Value, Total | 4,186,326 | 2,633,955
Gross Unrealized Losses, Total | 180,531 | 32,410
Foreign government |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value, Less than 12 Months | 809,004 | 758,975
Gross Unrealized Losses, Less than 12 Months | 29,721 | 15,793
Fair Value, 12 Months or Greater | 211,576 | 82,057
Gross Unrealized Losses, 12 Months or Greater | 34,092 | 31,701
Fair Value, Total | 1,020,580 | 841,032
Gross Unrealized Losses, Total | $ 63,813 | $ 47,494

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