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Segment Information (Income Before Federal Income Tax) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Segment Reporting Information [Line Items]    
Net investment income $ 30,769 $ 26,917
Net realized investment (losses) gains (2,704) 18,883
Total investment revenues before federal income tax 28,065 45,800
Tax on investment income 6,263 12,318
Total investment income after federal income tax 21,802 33,482
Standard Commercial Lines [Member]    
Segment Reporting Information [Line Items]    
Underwriting gain (loss), before federal income tax $ 30,932 $ 30,036
GAAP combined ratio 92.30% 91.80%
Statutory combined ratio 89.70% 89.70%
Standard Personal Lines [Member]    
Segment Reporting Information [Line Items]    
Underwriting gain (loss), before federal income tax $ 8,605 $ (2,466)
GAAP combined ratio 87.70% 103.40%
Statutory combined ratio 90.60% 105.10%
Excess And Surplus Operations [Member]    
Segment Reporting Information [Line Items]    
Underwriting gain (loss), before federal income tax $ 1,418 $ (1,549)
GAAP combined ratio 97.10% 104.10%
Statutory combined ratio 98.40% 102.10%