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Segment Information - Summary of Operating Results by Segment (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
USD ($)
segment
State
Subsidiary
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Segment Reporting [Abstract]      
Number of insurance companies | Subsidiary 12    
Number of states in which company operates | State 11    
Number of reportable segments | segment 1    
Segment Reporting Information [Line Items]      
Net premiums earned $ 5,075,456 $ 4,274,378 $ 3,952,482
Total incurred losses and loss adjustment expenses 3,684,511 3,517,853 3,362,219
Policy acquisition costs 858,261 708,525 654,612
Other operating expenses 327,157 279,656 279,718
Net investment income 279,989 234,630 168,356
Net realized investment gains (losses) 88,671 101,014 (488,080)
Other income 31,517 19,609 10,308
Interest expense (30,824) (24,169) (17,232)
Income (loss) before income taxes 574,880 99,428 (670,715)
Net income (loss) 467,953 96,336 (512,672)
Operating Segments      
Segment Reporting Information [Line Items]      
Net premiums earned 5,075,500 4,274,400 3,952,500
Losses 3,171,300 3,033,100 2,864,400
Loss adjustment expenses 513,200 484,800 497,800
Total incurred losses and loss adjustment expenses 3,684,500 3,517,900 3,362,200
Policy acquisition costs 858,300 708,500 654,600
Other operating expenses 327,200 279,700 279,700
Underwriting gain (loss) 205,500 (231,700) (344,000)
Net investment income 280,000 234,600 168,400
Net realized investment gains (losses) 88,700 101,000 (488,100)
Other income 31,500 19,700 10,200
Interest expense (30,800) (24,200) (17,200)
Income (loss) before income taxes 574,900 99,400 (670,700)
Net income (loss) 468,000 96,300 (512,700)
Property & Casualty      
Segment Reporting Information [Line Items]      
Net premiums earned 5,046,099 4,245,369 3,923,642
Property & Casualty | Operating Segments      
Segment Reporting Information [Line Items]      
Net premiums earned 5,046,100 4,245,400 3,923,600
Losses 3,156,400 3,019,400 2,851,300
Loss adjustment expenses 511,300 482,800 495,900
Total incurred losses and loss adjustment expenses 3,667,700 3,502,200 3,347,200
Policy acquisition costs 846,600 696,900 645,500
Other operating expenses 324,100 276,600 276,500
Underwriting gain (loss) 207,700 (230,300) (345,600)
Other | Operating Segments      
Segment Reporting Information [Line Items]      
Net premiums earned 29,400 29,000 28,900
Losses 14,900 13,700 13,100
Loss adjustment expenses 1,900 2,000 1,900
Total incurred losses and loss adjustment expenses 16,800 15,700 15,000
Policy acquisition costs 11,700 11,600 9,100
Other operating expenses 3,100 3,100 3,200
Underwriting gain (loss) $ (2,200) $ (1,400) $ 1,600