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Adoption of Accounting Pronouncements (Income Statement Statement) (Details) (USD $)
In Thousands, except Per Share data, 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
Net income 16,133 (20,142) 2,325 21,549 23,775 17,197 18,766 5,803 19,865 65,541 36,398
Combined ratio                 107.40% 101.60% 99.80%
Basic net income per share $ 0.30 $ (0.37) $ 0.04 $ 0.40 $ 0.44 $ 0.32 $ 0.35 $ 0.11 $ 0.37 $ 1.23 $ 0.69
Diluted net income per share $ 0.29 $ (0.37) $ 0.04 $ 0.39 $ 0.43 $ 0.32 $ 0.35 $ 0.11 $ 0.36 $ 1.20 $ 0.68
Retrospective Effect Of Change In Accounting Principle As Reported [Member]
                      
Underwriting (loss) profit                 (106,919) (22,167) 2,385
Net income                 19,865 65,541 36,398
Combined ratio                 107.40% 101.60% 99.80%
Basic net income per share                 $ 0.37 $ 1.23 $ 0.69
Diluted net income per share                 $ 0.36 $ 1.20 $ 0.68
Retrospective Effect Of Change In Accounting Principle As Restated [Member]
                      
Underwriting (loss) profit                 (103,584) (19,974) 2,111
Net income                 $ 22,033 $ 66,966 $ 36,220
Combined ratio                 107.20% 101.40% 99.90%
Basic net income per share                 $ 0.41 $ 1.26 $ 0.69
Diluted net income per share                 $ 0.40 $ 1.23 $ 0.68