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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, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Underwriting (loss) profit $ 4,971 $ (68,124) $ (32,682) $ (11,084) $ (468) $ (3,933) $ (3,161) $ (14,605) $ (106,919) $ (22,167) $ 2,385
GAAP combined ratio                 107.40% 101.60% 99.80%
Statutory combined ratio                 106.70% 101.60% 100.50%
Net investment income 28,839 35,786 39,345 43,473 41,471 32,986 36,545 34,706 147,443 145,708 118,471
Net realized gain on investments                 2,240 (7,083) (45,970)
Total investment income, before federal income tax                 149,683 138,625 72,501
Total all segments                 42,764 116,458 74,886
Interest expense                 (18,259) (18,616) (19,386)
General corporate and other expenses                 (16,440) (15,886) (16,314)
Income from continuing operations, before federal income tax                 8,065 81,956 39,186
Total Commercial Lines [Member]
                      
Underwriting (loss) profit                 (59,428) (1,668) 14,388
Total Personal Lines [Member]
                      
Underwriting (loss) profit                 $ (47,491) $ (20,499) $ (12,003)