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Segment Information (Income Before Federal Income Tax) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Segment Reporting Information [Line Items]        
Total investment revenues $ 28,810 $ 41,313 $ 74,610 $ 84,065
Tax on investment income 6,254 10,941 18,572 22,516
Total investment income after federal income tax 22,556 30,372 56,038 61,549
Standard Commercial Lines [Member]        
Segment Reporting Information [Line Items]        
Underwriting gain (loss), before federal income tax $ 35,241 $ 15,703 $ 65,277 $ 12,073
GAAP combined ratio 90.70% 95.60% 91.20% 98.30%
Statutory combined ratio 90.10% 95.50% 89.90% 97.80%
Standard Personal Lines [Member]        
Segment Reporting Information [Line Items]        
Underwriting gain (loss), before federal income tax $ (4,655) $ (5,582) $ (7,121) $ (7,942)
GAAP combined ratio 106.50% 107.50% 104.90% 105.30%
Statutory combined ratio 105.40% 106.10% 105.20% 105.30%
Excess And Surplus Operations [Member]        
Segment Reporting Information [Line Items]        
Underwriting gain (loss), before federal income tax $ (1,462) $ (37) $ (3,011) $ 938
GAAP combined ratio 103.60% 100.10% 103.80% 98.60%
Statutory combined ratio 102.70% 99.90% 102.50% 98.80%