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Segment Information - Summary of Operating Results by Segment (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
State
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Subsidiary
segment
State
Jun. 30, 2018
USD ($)
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 premiums earned $ 888,776 $ 833,959 $ 1,759,021 $ 1,642,043
Losses and loss adjustment expenses 656,577 605,547 1,286,993 1,237,781
Underwriting expenses 217,000 202,500 432,900 408,800
Underwriting gain (loss) 15,200 26,000 39,100 (4,600)
Net investment income 35,032 34,786 69,206 66,296
Net realized investment gains (losses) 53,329 14,290 164,403 (44,445)
Other 2,350 2,356 4,600 4,681
Interest expense (4,266) (4,256) (8,522) (8,522)
Pre-tax income 101,595 73,246 268,764 13,547
Net income 83,250 60,180 219,117 17,573
Property and Casualty Lines [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 881,800 826,200 1,744,900 1,626,400
Losses and loss adjustment expenses 653,300 601,500 1,280,100 1,229,900
Underwriting expenses 213,500 198,700 426,000 401,200
Underwriting gain (loss) 15,000 26,000 38,800 (4,700)
Other Segments [Member]        
Segment Reporting Information [Line Items]        
Net premiums earned 7,000 7,800 14,100 15,600
Losses and loss adjustment expenses 3,300 4,000 6,900 7,900
Underwriting expenses 3,500 3,800 6,900 7,600
Underwriting gain (loss) $ 200 $ 0 $ 300 $ 100