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Business Concentration (Details)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Net Premiums Written [Member]
   
Concentration Risk [Line Items]    
Concentration percentage 14.00% 22.60%
Texas [Member] | Geographic Concentration Risk [Member]
   
Concentration Risk [Line Items]    
Concentration percentage 24.80% 32.20%
North Carolina [Member] | Geographic Concentration Risk [Member]
   
Concentration Risk [Line Items]    
Concentration percentage 30.50% 26.60%