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Fair Value Measurements - Quantitative Disclosures of Fair Value Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
AFS fixed income securities	$ 8,876,667	$ 8,127,334
Equity securities	318,059	213,601
Short-term investments	531,441	509,318
Fair Value Measured at Net Asset Value Per Share
Equity securities	216,600	169,500
U.S. government and government agencies
AFS fixed income securities	129,441	120,155
Foreign government
AFS fixed income securities	10,523	9,302
Obligations of states and political subdivisions
AFS fixed income securities	458,658	451,230
Corporate securities
AFS fixed income securities	3,314,092	3,068,180
CLO and other ABS
AFS fixed income securities	2,276,180	2,033,149
RMBS
AFS fixed income securities	1,943,567	1,692,358
CMBS
AFS fixed income securities	744,206	752,960
Fair Value, Recurring
AFS fixed income securities	8,876,667	8,127,334
Equity securities	318,059	213,601
Short-term investments	531,441	509,318
Total assets measured at fair value	9,726,167	8,850,253
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1)
AFS fixed income securities	38,533	35,518
Equity securities	101,500	43,279
Short-term investments	521,542	474,225
Total assets measured at fair value	661,575	553,022
Fair Value, Recurring | Significant Other Observable Inputs (Level 2)
AFS fixed income securities	8,081,407	7,473,377
Equity securities	0	0
Short-term investments	9,899	35,093
Total assets measured at fair value	8,091,306	7,508,470
Fair Value, Recurring | Significant Unobservable Inputs (Level 3)
AFS fixed income securities	756,727	618,439
Equity securities	0	808
Short-term investments	0	0
Total assets measured at fair value	756,727	619,247
Fair Value, Recurring | U.S. government and government agencies
AFS fixed income securities	129,441	120,155
Fair Value, Recurring | U.S. government and government agencies | Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1)
AFS fixed income securities	38,533	35,518
Fair Value, Recurring | U.S. government and government agencies | Significant Other Observable Inputs (Level 2)
AFS fixed income securities	90,908	84,637
Fair Value, Recurring | U.S. government and government agencies | Significant Unobservable Inputs (Level 3)
AFS fixed income securities	0	0
Fair Value, Recurring | Foreign government
AFS fixed income securities	10,523	9,302
Fair Value, Recurring | Foreign government | Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1)
AFS fixed income securities	0	0
Fair Value, Recurring | Foreign government | Significant Other Observable Inputs (Level 2)
AFS fixed income securities	10,523	9,302
Fair Value, Recurring | Foreign government | Significant Unobservable Inputs (Level 3)
AFS fixed income securities	0	0
Fair Value, Recurring | Obligations of states and political subdivisions
AFS fixed income securities	458,658	451,230
Fair Value, Recurring | Obligations of states and political subdivisions | Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1)
AFS fixed income securities	0	0
Fair Value, Recurring | Obligations of states and political subdivisions | Significant Other Observable Inputs (Level 2)
AFS fixed income securities	451,128	443,804
Fair Value, Recurring | Obligations of states and political subdivisions | Significant Unobservable Inputs (Level 3)
AFS fixed income securities	7,530	7,426
Fair Value, Recurring | Corporate securities
AFS fixed income securities	3,314,092	3,068,180
Fair Value, Recurring | Corporate securities | Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1)
AFS fixed income securities	0	0
Fair Value, Recurring | Corporate securities | Significant Other Observable Inputs (Level 2)
AFS fixed income securities	3,046,271	2,825,501
Fair Value, Recurring | Corporate securities | Significant Unobservable Inputs (Level 3)
AFS fixed income securities	267,821	242,679
Fair Value, Recurring | CLO and other ABS
AFS fixed income securities	2,276,180	2,033,149
Fair Value, Recurring | CLO and other ABS | Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1)
AFS fixed income securities	0	0
Fair Value, Recurring | CLO and other ABS | Significant Other Observable Inputs (Level 2)
AFS fixed income securities	1,795,143	1,665,155
Fair Value, Recurring | CLO and other ABS | Significant Unobservable Inputs (Level 3)
AFS fixed income securities	481,037	367,994
Fair Value, Recurring | RMBS
AFS fixed income securities	1,943,567	1,692,358
Fair Value, Recurring | RMBS | Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1)
AFS fixed income securities	0	0
Fair Value, Recurring | RMBS | Significant Other Observable Inputs (Level 2)
AFS fixed income securities	1,943,567	1,692,358
Fair Value, Recurring | RMBS | Significant Unobservable Inputs (Level 3)
AFS fixed income securities	0	0
Fair Value, Recurring | CMBS
AFS fixed income securities	744,206	752,960
Fair Value, Recurring | CMBS | Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1)
AFS fixed income securities	0	0
Fair Value, Recurring | CMBS | Significant Other Observable Inputs (Level 2)
AFS fixed income securities	743,867	752,620
Fair Value, Recurring | CMBS | Significant Unobservable Inputs (Level 3)
AFS fixed income securities	339	340
Fair Value, Recurring | Common Stock
Equity securities	316,224	211,767
Fair Value, Recurring | Common Stock | Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1)
Equity securities	99,665	41,445
Fair Value, Recurring | Common Stock | Significant Other Observable Inputs (Level 2)
Equity securities	0	0
Fair Value, Recurring | Common Stock | Significant Unobservable Inputs (Level 3)
Equity securities	0	808
Fair Value, Recurring | Preferred stock
Equity securities	1,835	1,834
Fair Value, Recurring | Preferred stock | Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1)
Equity securities	1,835	1,834
Fair Value, Recurring | Preferred stock | Significant Other Observable Inputs (Level 2)
Equity securities	0	0
Fair Value, Recurring | Preferred stock | Significant Unobservable Inputs (Level 3)
Equity securities	$ 0	$ 0

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