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Reinsurance (Details Textual) (USD $)
3 Months Ended
Mar. 31, 2013
Reinsurers
Dec. 31, 2012
Reinsurers
Mar. 31, 2013
Credit Concentration Risk [Member]
Mar. 31, 2012
Credit Concentration Risk [Member]
Reinsurance (Additional Textual) [Abstract]        
Recoveries pertaining to reinsurance contracts     $ 0 $ 0
Reinsurance (Textual) [Abstract]        
Number of reinsurers 31 31    
Reinsurance recoverables 0 0    
Credit risk associated with reinsurance receivables $ 0 $ 0