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Fair Value Measurements - Quantitative Disclosures of Fair Value Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
AFS fixed income securities	$ 8,605,175	$ 8,127,334
Equity securities	266,471	213,601
Short-term investments	631,090	509,318
U.S. government and government agencies
AFS fixed income securities	134,475	120,155
Foreign government
AFS fixed income securities	10,388	9,302
Obligations of states and political subdivisions
AFS fixed income securities	432,950	451,230
Corporate securities
AFS fixed income securities	3,237,221	3,068,180
CLO and other ABS
AFS fixed income securities	2,197,185	2,033,149
RMBS
AFS fixed income securities	1,852,079	1,692,358
CMBS
AFS fixed income securities	740,877	752,960
Fair Value Measured at Net Asset Value Per Share
Equity securities	196,200	169,500
Fair Value, Recurring
AFS fixed income securities	8,605,175	8,127,334
Equity securities	266,471	213,601
Short-term investments	631,090	509,318
Total assets measured at fair value	9,502,736	8,850,253
Fair Value, Recurring | U.S. government and government agencies
AFS fixed income securities	134,475	120,155
Fair Value, Recurring | Foreign government
AFS fixed income securities	10,388	9,302
Fair Value, Recurring | Obligations of states and political subdivisions
AFS fixed income securities	432,950	451,230
Fair Value, Recurring | Corporate securities
AFS fixed income securities	3,237,221	3,068,180
Fair Value, Recurring | CLO and other ABS
AFS fixed income securities	2,197,185	2,033,149
Fair Value, Recurring | RMBS
AFS fixed income securities	1,852,079	1,692,358
Fair Value, Recurring | CMBS
AFS fixed income securities	740,877	752,960
Fair Value, Recurring | Common Stock
Equity securities	264,650	211,767
Fair Value, Recurring | Preferred stock
Equity securities	1,821	1,834
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1)
AFS fixed income securities	38,061	35,518
Equity securities	69,423	43,279
Short-term investments	630,818	474,225
Total assets measured at fair value	738,302	553,022
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1) | U.S. government and government agencies
AFS fixed income securities	38,061	35,518
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	67,602	41,445
Fair Value, Recurring | Quoted Prices in Active Markets for Identical Assets/ Liabilities (Level 1) | Preferred stock
Equity securities	1,821	1,834
Fair Value, Recurring | Significant Other Observable Inputs (Level 2)
AFS fixed income securities	7,905,444	7,473,377
Equity securities	0	0
Short-term investments	272	35,093
Total assets measured at fair value	7,905,716	7,508,470
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | U.S. government and government agencies
AFS fixed income securities	96,414	84,637
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Foreign government
AFS fixed income securities	10,388	9,302
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Obligations of states and political subdivisions
AFS fixed income securities	425,344	443,804
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | Corporate securities
AFS fixed income securities	2,996,304	2,825,501
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | CLO and other ABS
AFS fixed income securities	1,784,383	1,665,155
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | RMBS
AFS fixed income securities	1,852,079	1,692,358
Fair Value, Recurring | Significant Other Observable Inputs (Level 2) | CMBS
AFS fixed income securities	740,532	752,620
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	661,670	618,439
Equity securities	841	808
Short-term investments	0	0
Total assets measured at fair value	662,511	619,247
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	7,606	7,426
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Corporate securities
AFS fixed income securities	240,917	242,679
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | CLO and other ABS
AFS fixed income securities	412,802	367,994
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	345	340
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Common Stock
Equity securities	841	808
Fair Value, Recurring | Significant Unobservable Inputs (Level 3) | Preferred stock
Equity securities	$ 0	$ 0

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