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Quarterly Results for 2012 and 2011 (Unaudited) (Details Textual) (USD $) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Quarterly Results for 2012 and 2011 (Unaudited) (Textual) [Abstract] |  |  |  |  |
Increase in net income during period | $ 6,700,000 |  |  |  |
Increase in revenue during period | 16,800,000 |  |  |  |
Increase in net earned premiums during period | 15,500,000 |  |  |  |
Improvement in performance of investment trading portfolio during period | 1,900,000 |  |  |  |
Decrease in losses and loss adjustment expenses during period | 8,700,000 |  |  |  |
Increase in general and administrative expenses during period | 12,400,000 |  |  |  |
Charges paid to insurance guaranty association during period | 6,300,000 |  | 6,300,000 |  |
Increase in policy acquisition cost during period | 2,300,000 |  |  |  |
Increase in compensation expenses during period | 1,700,000 |  |  |  |
Increase in insurance expenses during period | 1,000,000 |  |  |  |
Increase in legal fees during period | $ 398,000,000 |  |  |  |
Effective tax rate | 52.90% | 37.80% | 42.30% | 40.40% | 40.60%

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