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Reinsurance (Details 1) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Prepaid Reinsurance Premiums and Reinsurance Recoverables    
Prepaid reinsurance premiums $ 248,899 $ 243,095
Reinsurance recoverable on unpaid losses and LAE 74,160 88,002
Reinsurance recoverable on paid losses 6,640 (2,296)
Reinsurance receivables, net 30,528 55,205
Reinsurance recoverables and receivables $ 111,328 $ 140,911