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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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