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Segment Information - Summary of Operating Results by Segment (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
State
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Subsidiary
segment
State
Jun. 30, 2023
USD ($)
Segment Reporting [Abstract]        
Number of insurance companies | Subsidiary     12  
Number of states in which company operates | State 11   11  
Number of reportable segments | segment     1  
Segment Reporting Information [Line Items]        
Net premiums earned $ 1,236,024 $ 1,034,469 $ 2,402,703 $ 2,039,173
Losses and loss adjustment expenses 936,714 897,810 1,840,679 1,827,339
Underwriting expenses 285,400 241,200 558,500 475,300
Underwriting gain (loss) 13,900 (104,500) 3,500 (263,400)
Net investment income 68,970 58,350 133,989 110,323
Net realized investment gains (losses) 2,899 (19,778) 41,090 29,229
Other (loss) income (2,899) 10,186 1,298 11,081
Interest expense (7,799) (5,549) (15,572) (10,479)
Pre-tax income (loss) 75,097 (61,210) 164,317 (123,288)
Net income (loss) 62,568 (41,543) 136,030 (86,831)
Property & Casualty        
Segment Reporting Information [Line Items]        
Net premiums earned 1,228,696 1,027,270 2,388,065 2,024,832
Losses and loss adjustment expenses 932,400 893,900 1,832,400 1,819,700
Underwriting expenses 282,000 237,400 551,300 468,000
Underwriting gain (loss) 14,300 (104,000) 4,400 (262,900)
Other        
Segment Reporting Information [Line Items]        
Net premiums earned 7,300 7,200 14,600 14,400
Losses and loss adjustment expenses 4,300 3,900 8,300 7,600
Underwriting expenses 3,400 3,800 7,200 7,300
Underwriting gain (loss) $ (400) $ (500) $ (900) $ (500)