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Reinsurance (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Reinsurance [Abstract]        
Premiums ceded to reinsurers $ 27,110 $ 21,699 $ 76,329 $ 64,145
Losses and loss expenses ceded to reinsurers 21,338 9,509 40,475 35,338
Commissions from reinsurers $ 3,550 $ 2,976 $ 10,523 $ 8,291