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Segment Information (Income From Continuing Operations, Before Federal Income Tax) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Segment Reporting Information [Line Items]        
Net investment income $ 34,003 $ 34,006 $ 66,873 $ 66,634
Net realized investment gains 5,154 178 8,509 4,536
Total investment revenues 39,157 34,184 75,382 71,170
Total all segments 43,640 7,222 92,026 42,845
Interest expense (5,570) (4,723) (11,401) (9,423)
General corporate and other expenses (1,869) (3,191) (15,556) (10,923)
Income (loss) from continuing operations before federal income tax 36,201 (692) 65,069 22,499
Total standard Commercial Lines [Member]
        
Segment Reporting Information [Line Items]        
Underwriting gain (loss), before federal income tax 9,743 (14,424) 15,845 (14,015)
Total standard Personal Lines [Member]
        
Segment Reporting Information [Line Items]        
Underwriting gain (loss), before federal income tax (2,975) (7,438) 2,998 (4,317)
Total Standard Insurance Operations [Member]
        
Segment Reporting Information [Line Items]        
Underwriting gain (loss), before federal income tax 6,768 (21,862) 18,843 (18,332)
GAAP combined ratio 98.30% 105.80% 97.60% 102.50%
Statutory combined ratio 97.00% 105.50% 96.90% 101.80%
Excess And Surplus Operations [Member]
        
Segment Reporting Information [Line Items]        
Underwriting gain (loss), before federal income tax $ (2,285) $ (5,100) $ (2,199) $ (9,993)
GAAP combined ratio 107.60% 131.90% 103.70% 138.90%
Statutory combined ratio 106.80% 116.10% 102.60% 118.00%