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Segment Information (Income Before Federal Income Tax) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Segment Reporting Information [Line Items]        
Net investment income $ 31,182 $ 32,230 $ 61,951 $ 59,147
Net realized investment gains (losses) 1,765 (3,420) (939) 15,463
Total investment income, before federal income tax 32,947 28,810 61,012 74,610
Tax on investment income 8,275 6,254 14,538 18,572
Total investment income, after federal income tax 24,672 22,556 46,474 56,038
Standard Commercial Lines [Member]        
Segment Reporting Information [Line Items]        
Underwriting gain (loss), before federal income tax $ 40,173 $ 35,241 $ 71,105 $ 65,277
GAAP combined ratio 90.20% 90.70% 91.30% 91.20%
Statutory combined ratio 88.60% 90.10% 89.10% 89.90%
Standard Personal Lines [Member]        
Segment Reporting Information [Line Items]        
Underwriting gain (loss), before federal income tax $ 6,125 $ (4,655) $ 14,730 $ (7,121)
GAAP combined ratio 91.40% 106.50% 89.60% 104.90%
Statutory combined ratio 89.90% 105.40% 90.10% 105.20%
Excess And Surplus Operations [Member]        
Segment Reporting Information [Line Items]        
Underwriting gain (loss), before federal income tax $ (2,521) $ (1,462) $ (1,103) $ (3,011)
GAAP combined ratio 105.10% 103.60% 101.10% 103.80%
Statutory combined ratio 102.70% 102.70% 100.60% 102.50%