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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
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