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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, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Underwriting income (loss), before federal income tax $ (36,543) $ 861 $ (26,962) $ (1,363) $ 7,895 $ (64,779) $ (34,002) $ (12,698)      
GAAP Combined Ratio                   107.20% 101.40%
Net investment income 34,593 30,650 34,006 32,628 28,839 35,786 39,345 43,473 131,877 147,443 145,708
Net realized gains (losses) on investments                 8,988 2,240 (7,083)
Total investment revenues                 140,865 149,683 138,625
Total all segments                 76,858 46,099 118,651
Interest expense                 (18,872) (18,259) (18,616)
General corporate and other expenses                 (20,351) (16,440) (15,886)
Income from continuing operations, before federal income tax                 37,635 11,400 84,149
Total standard Commercial Lines [Member]
                      
Underwriting income (loss), before federal income tax                 (40,935) (49,952) 180
Total standard Personal Lines [Member]
                      
Underwriting income (loss), before federal income tax                 (3,514) (46,971) (20,154)
Total Standard Insurance Operations [Member]
                      
Underwriting income (loss), before federal income tax                 (44,449) (96,923) (19,974)
GAAP Combined Ratio                 103.00% 106.80% 101.40%
Statutory Combined Ratio                 102.50% 106.40% 101.60%
Excess And Surplus Operations [Member]
                      
Underwriting income (loss), before federal income tax                 $ (19,558) $ (6,661) $ 0
GAAP Combined Ratio                 124.70% 270.20% 0.00%
Statutory Combined Ratio                 118.80% 131.30% 0.00%