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Fair Value Measurements - Quantitative Disclosures of Fair Value Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
AFS fixed income securities | $ 8,088,601 | $ 7,499,197
Equity securities | 205,634 | 187,155
Short-term investments | 561,032 | 309,317
U.S. government and government agencies |  |
AFS fixed income securities | 125,402 | 205,035
Foreign government |  |
AFS fixed income securities | 9,662 | 9,803
Obligations of states and political subdivisions |  |
AFS fixed income securities | 492,856 | 585,965
Corporate securities |  |
AFS fixed income securities | 3,026,785 | 2,711,239
CLO and other ABS |  |
AFS fixed income securities | 1,946,393 | 1,834,827
RMBS |  |
AFS fixed income securities | 1,740,009 | 1,477,483
CMBS |  |
AFS fixed income securities | 747,494 | 674,845
Fair Value Measured at Net Asset Value Per Share |  |
Equity securities | 168,300 | 163,900
Fair Value, Recurring |  |
AFS fixed income securities | 8,088,601 | 7,499,197
Equity securities | 205,634 | 187,155
Short-term investments | 561,032 | 309,317
Total assets measured at fair value | 8,855,267 | 7,995,669
Fair Value, Recurring | U.S. government and government agencies |  |
AFS fixed income securities | 125,402 | 205,035
Fair Value, Recurring | Foreign government |  |
AFS fixed income securities | 9,662 | 9,803
Fair Value, Recurring | Obligations of states and political subdivisions |  |
AFS fixed income securities | 492,856 | 585,965
Fair Value, Recurring | Corporate securities |  |
AFS fixed income securities | 3,026,785 | 2,711,239
Fair Value, Recurring | CLO and other ABS |  |
AFS fixed income securities | 1,946,393 | 1,834,827
Fair Value, Recurring | RMBS |  |
AFS fixed income securities | 1,740,009 | 1,477,483
Fair Value, Recurring | CMBS |  |
AFS fixed income securities | 747,494 | 674,845
Fair Value, Recurring | Common Stock |  |
Equity securities | 203,733 | 185,339
Fair Value, Recurring | Preferred stock |  |
Equity securities | 1,901 | 1,816
Fair Value, Recurring | Quoted Prices in  Active Markets for Identical Assets/ Liabilities (Level 1) |  |
AFS fixed income securities | 36,523 | 34,056
Equity securities | 36,479 | 22,398
Short-term investments | 512,553 | 308,512
Total assets measured at fair value | 585,555 | 364,966
Fair Value, Recurring | Quoted Prices in  Active Markets for Identical Assets/ Liabilities (Level 1) | U.S. government and government agencies |  |
AFS fixed income securities | 36,523 | 34,056
Fair Value, Recurring | Quoted Prices in  Active Markets for Identical Assets/ Liabilities (Level 1) | Foreign government |  |
AFS fixed income securities | 0 | 0
Fair Value, Recurring | Quoted Prices in  Active Markets for Identical Assets/ Liabilities (Level 1) | Obligations of states and political subdivisions |  |
AFS fixed income securities | 0 | 0
Fair Value, Recurring | Quoted Prices in  Active Markets for Identical Assets/ Liabilities (Level 1) | Corporate securities |  |
AFS fixed income securities | 0 | 0
Fair Value, Recurring | Quoted Prices in  Active Markets for Identical Assets/ Liabilities (Level 1) | CLO and other ABS |  |
AFS fixed income securities | 0 | 0
Fair Value, Recurring | Quoted Prices in  Active Markets for Identical Assets/ Liabilities (Level 1) | RMBS |  |
AFS fixed income securities | 0 | 0
Fair Value, Recurring | Quoted Prices in  Active Markets for Identical Assets/ Liabilities (Level 1) | CMBS |  |
AFS fixed income securities | 0 | 0
Fair Value, Recurring | Quoted Prices in  Active Markets for Identical Assets/ Liabilities (Level 1) | Common Stock |  |
Equity securities | 34,578 | 20,582
Fair Value, Recurring | Quoted Prices in  Active Markets for Identical Assets/ Liabilities (Level 1) | Preferred stock |  |
Equity securities | 1,901 | 1,816
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) |  |
AFS fixed income securities | 7,486,228 | 6,914,306
Equity securities | 0 | 0
Short-term investments | 48,479 | 805
Total assets measured at fair value | 7,534,707 | 6,915,111
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | U.S. government and government agencies |  |
AFS fixed income securities | 88,879 | 170,979
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Foreign government |  |
AFS fixed income securities | 9,662 | 9,803
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Obligations of states and political subdivisions |  |
AFS fixed income securities | 485,125 | 578,131
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Corporate securities |  |
AFS fixed income securities | 2,777,246 | 2,413,907
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | CLO and other ABS |  |
AFS fixed income securities | 1,638,175 | 1,589,514
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | RMBS |  |
AFS fixed income securities | 1,740,009 | 1,477,483
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | CMBS |  |
AFS fixed income securities | 747,132 | 674,489
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Common Stock |  |
Equity securities | 0 | 0
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Preferred stock |  |
Equity securities | 0 | 0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) |  |
AFS fixed income securities | 565,850 | 550,835
Equity securities | 875 | 854
Short-term investments | 0 | 0
Total assets measured at fair value | 566,725 | 551,689
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | U.S. government and government agencies |  |
AFS fixed income securities | 0 | 0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Foreign government |  |
AFS fixed income securities | 0 | 0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Obligations of states and political subdivisions |  |
AFS fixed income securities | 7,731 | 7,834
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Corporate securities |  |
AFS fixed income securities | 249,539 | 297,332
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | CLO and other ABS |  |
AFS fixed income securities | 308,218 | 245,313
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | RMBS |  |
AFS fixed income securities | 0 | 0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | CMBS |  |
AFS fixed income securities | 362 | 356
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Common Stock |  |
Equity securities | 875 | 854
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Preferred stock |  |
Equity securities | $ 0 | $ 0

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