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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
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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Fair value portion of asset recognized for present right to economic benefit.

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