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Segment Information (Income From Continuing Operations, Before Federal Income Tax) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Segment Reporting Information [Line Items]        
Net investment income earned $ 34,292 $ 32,457 $ 106,600 $ 99,330
Net realized investment gains 15,231 13,431 26,988 21,940
Total investment revenues 49,523 45,888 133,588 121,270
Tax on investment income 13,858 12,648 36,374 31,960
Total investment income after federal income tax 35,665 33,240 97,214 89,310
Total Standard Commercial Lines [Member]
        
Segment Reporting Information [Line Items]        
Underwriting gain (loss), before federal income tax 27,771 8,776 39,844 24,621
Total Standard Personal Lines [Member]
        
Segment Reporting Information [Line Items]        
Underwriting gain (loss), before federal income tax 8,037 1,362 95 4,360
Total Standard Insurance Operations [Member]
        
Segment Reporting Information [Line Items]        
Underwriting gain (loss), before federal income tax 35,808 10,138 39,939 28,981
GAAP combined ratio 91.60% 97.50% 96.90% 97.60%
Statutory combined ratio 90.50% 96.00% 96.30% 96.60%
Excess And Surplus Operations [Member]
        
Segment Reporting Information [Line Items]        
Underwriting gain (loss), before federal income tax $ (1,371) $ 13 $ (433) $ (2,186)
GAAP combined ratio 103.80% 100.00% 100.40% 102.40%
Statutory combined ratio 102.90% 100.50% 100.30% 101.90%