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Segment Information - Summary of Operating Results by Segment (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
State
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
segment
Subsidiary
State
Jun. 30, 2020
USD ($)
Segment Reporting [Abstract]        
Number of insurance companies | Subsidiary     14  
Number of states in which company operates | State 11   11  
Number of reportable segments | segment     1  
Segment Reporting Information [Line Items]        
Net $ 926,820 $ 811,898 $ 1,842,741 $ 1,734,471
Losses and loss adjustment expenses 657,228 495,300 1,283,572 1,146,970
Underwriting expenses 222,000 220,800 451,800 453,900
Underwriting gain (loss) 47,600 95,800 107,300 133,600
Net investment income 30,953 34,166 63,232 68,661
Net realized investment gains 58,805 158,426 100,496 (92,894)
Other income 2,197 1,353 5,402 3,915
Interest expense (4,235) (4,268) (8,577) (8,523)
Pre-tax income 135,401 285,466 267,823 104,760
Net income 109,181 228,211 216,176 89,007
Property and Casualty Lines [Member]        
Segment Reporting Information [Line Items]        
Net 919,515 804,797 1,828,330 1,720,140
Losses and loss adjustment expenses 653,600 492,100 1,276,500 1,140,300
Underwriting expenses 218,100 217,400 445,100 446,800
Underwriting gain (loss) 47,800 95,300 106,700 133,000
Other Segments [Member]        
Segment Reporting Information [Line Items]        
Net 7,300 7,100 14,400 14,400
Losses and loss adjustment expenses 3,600 3,200 7,100 6,700
Underwriting expenses 3,900 3,400 6,700 7,100
Underwriting gain (loss) $ (200) $ 500 $ 600 $ 600