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Commitments and Contingencies (Details Textuals) (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Commitments And Contingencies Line Items [Abstract]    
Liability related to indemnifications $ 7.6  
Pretax cat loss after reinsurance $ 44.5 $ 20.3
Longest Indemnification Expiration Date 2025