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Segment Information (Income From Continuing Operations, Before Federal Income Tax) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Underwriting gain (loss), before federal income tax $ 11,971 $ 10,151 $ 4,483 $ 12,161 $ (36,543) $ 861 $ (26,962) $ (1,363)      
GAAP Combined Ratio                     107.20%
Net investment income 35,313 32,457 34,003 32,870 34,593 30,650 34,006 32,628 134,643 131,877 147,443
Net realized investment gains                 20,732 8,988 2,240
Total investment revenues                 155,375 140,865 149,683
Tax on investment income                 40,489 34,758 37,139
Total investment income, after federal income tax                 114,886 106,107 112,544
Total standard Commercial Lines [Member]
                      
Underwriting gain (loss), before federal income tax                 33,856 (40,935) (49,952)
Total standard Personal Lines [Member]
                      
Underwriting gain (loss), before federal income tax                 8,645 (3,514) (46,971)
Total Standard Insurance Operations [Member]
                      
Underwriting gain (loss), before federal income tax                 42,501 (44,449) (96,923)
GAAP Combined Ratio                 97.40% 103.00% 106.80%
Statutory Combined Ratio                 97.10% 102.50% 106.40%
Excess And Surplus Operations [Member]
                      
Underwriting gain (loss), before federal income tax                 $ (3,735) $ (19,558) $ (6,661)
GAAP Combined Ratio                 103.00% 124.70% 270.20%
Statutory Combined Ratio                 102.90% 118.80% 131.30%