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Fair Value Measurements - Schedule of Quantitative Disclosures of Fair Value Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | $ 8,127,334 | $ 7,499,197
Equity securities | 213,601 | 187,155
Short-term investments | 509,318 | 309,317
U.S. government and government agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | 120,155 | 205,035
Foreign government |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | 9,302 | 9,803
Obligations of states and political subdivisions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | 451,230 | 585,965
Corporate securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | 3,068,180 | 2,711,239
CLO and other ABS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | 2,033,149 | 1,834,827
RMBS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | 1,692,358 | 1,477,483
CMBS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | 752,960 | 674,845
Fair Value Measured at Net Asset Value Per Share |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 169,500 | 163,900
Fair Value, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | 8,127,334 | 7,499,197
Equity securities | 213,601 | 187,155
Short-term investments | 509,318 | 309,317
Total assets measured at fair value | 8,850,253 | 7,995,669
Fair Value, Recurring | U.S. government and government agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | 120,155 | 205,035
Fair Value, Recurring | Foreign government |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | 9,302 | 9,803
Fair Value, Recurring | Obligations of states and political subdivisions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | 451,230 | 585,965
Fair Value, Recurring | Corporate securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | 3,068,180 | 2,711,239
Fair Value, Recurring | CLO and other ABS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | 2,033,149 | 1,834,827
Fair Value, Recurring | RMBS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | 1,692,358 | 1,477,483
Fair Value, Recurring | CMBS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | 752,960 | 674,845
Fair Value, Recurring | Common stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 211,767 | 185,339
Fair Value, Recurring | Preferred stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 1,834 | 1,816
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | 35,518 | 34,056
Equity securities | 43,279 | 22,398
Short-term investments | 474,225 | 308,512
Total assets measured at fair value | 553,022 | 364,966
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1) | U.S. government and government agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | 35,518 | 34,056
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1) | Foreign government |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
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 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | 0 | 0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1) | Corporate securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | 0 | 0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1) | CLO and other ABS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | 0 | 0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1) | RMBS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | 0 | 0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1) | CMBS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | 0 | 0
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1) | Common stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 41,445 | 20,582
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1) | Preferred stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 1,834 | 1,816
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | 7,473,377 | 6,914,306
Equity securities | 0 | 0
Short-term investments | 35,093 | 805
Total assets measured at fair value | 7,508,470 | 6,915,111
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | U.S. government and government agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | 84,637 | 170,979
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Foreign government |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | 9,302 | 9,803
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Obligations of states and political subdivisions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | 443,804 | 578,131
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Corporate securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | 2,825,501 | 2,413,907
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | CLO and other ABS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | 1,665,155 | 1,589,514
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | RMBS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | 1,692,358 | 1,477,483
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | CMBS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | 752,620 | 674,489
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Common stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 0 | 0
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Preferred stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 0 | 0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | 618,439 | 550,835
Equity securities | 808 | 854
Short-term investments | 0 | 0
Total assets measured at fair value | 619,247 | 551,689
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | U.S. government and government agencies |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | 0 | 0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Foreign government |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | 0 | 0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Obligations of states and political subdivisions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | 7,426 | 7,834
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Corporate securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | 242,679 | 297,332
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | CLO and other ABS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | 367,994 | 245,313
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | RMBS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | 0 | 0
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | CMBS |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
AFS fixed income securities | 340 | 356
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Common stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | 808 | 854
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Preferred stock |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities | $ 0 | $ 0

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