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Segment Information - Summary of Operating Results by Segment (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
State
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
State
Subsidiary
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Segment Reporting [Abstract]                      
Number of insurance companies | Subsidiary                 14    
Number of states in which company operates | State 11               11    
Segment Reporting Information [Line Items]                      
Net premiums earned $ 794,517 $ 790,850 $ 779,321 $ 767,085 $ 760,094 $ 745,520 $ 731,546 $ 720,737 $ 3,131,773 $ 2,957,897 $ 2,796,195
Losses and loss adjustment expenses                 2,355,138 2,145,495 1,986,122
Underwriting expenses                 797,900 790,000 775,600
Underwriting (loss) gain                 (21,200) 22,400 34,500
Net investment income                 121,871 126,299 125,723
Net realized investment (losses) gains         (8,200)       (34,255) (83,807) 81,184
Other                 8,294 8,911 8,671
Interest Expense                 (3,962) (3,168) (2,637)
Pre-tax income (51,270) 31,625 64,335 26,034 23,930 12,267 4,511 29,859 70,724 70,567 247,425
Net income $ (26,082) $ 26,930 $ 48,873 $ 23,323 $ 23,405 $ 15,270 $ 9,639 $ 26,165 73,044 74,479 177,949
Property and Casualty Lines [Member]                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 3,089,900 2,906,600 2,737,300
Losses and loss adjustment expenses                 2,333,200 2,117,300 1,951,400
Underwriting expenses                 780,400 770,000 749,700
Underwriting (loss) gain                 (23,700) 19,300 36,200
Other Segments [Member]                      
Segment Reporting Information [Line Items]                      
Net premiums earned                 41,900 51,300 58,900
Losses and loss adjustment expenses                 21,900 28,200 34,700
Underwriting expenses                 17,500 20,000 25,900
Underwriting (loss) gain                 $ 2,500 $ 3,100 $ (1,700)