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Segment Information - Summary of Operating Results by Segment (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
State
Subsidiary
segment
Dec. 31, 2022
USD ($)
Dec. 31, 2021
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 $ 4,274,378 $ 3,952,482 $ 3,741,948
Losses and loss adjustment expenses 3,517,853 3,362,219 2,760,155
Underwriting expenses 988,100 934,400 916,700
Underwriting (loss) gain (231,600) (344,100) 65,000
Net investment income 234,630 168,356 129,727
Net realized investment gains (losses) 101,014 (488,080) 111,658
Other income 19,609 10,308 10,024
Interest expense (24,169) (17,232) (17,113)
Income (loss) before income taxes 99,428 (670,715) 299,307
Net income (loss) 96,336 (512,672) 247,937
Property & Casualty      
Segment Reporting Information [Line Items]      
Net premiums earned 4,245,369 3,923,642 3,712,910
Losses and loss adjustment expenses 3,502,200 3,347,200 2,746,300
Underwriting expenses 973,400 922,100 902,600
Underwriting (loss) gain (230,200) (345,700) 64,000
Other      
Segment Reporting Information [Line Items]      
Net premiums earned 29,000 28,900 29,000
Losses and loss adjustment expenses 15,700 15,000 13,900
Underwriting expenses 14,700 12,300 14,100
Underwriting (loss) gain $ (1,400) $ 1,600 $ 1,000