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Quarterly Results for 2012 and 2011 (Unaudited) (Details Textual) (USD $)
 3 Months Ended 12 Months Ended
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%