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Losses and Loss Adjustment Expenses (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Liability for losses and loss adjustment expenses        
Balance, beginning of period $ 33,476 $ 24,050 $ 27,424 $ 22,146
Incurred related to:        
Current period 15,995 6,696 34,401 15,432
Prior period 202 3,827 964 5,494
Total incurred 16,197 10,523 35,365 20,926
Paid related to:        
Current period (8,691) (6,475) (13,082) (8,128)
Prior period (3,669) (3,125) (12,394) (9,971)
Total paid (12,360) (9,600) (25,476) (18,099)
Balance, end of period $ 37,313 $ 24,973 $ 37,313 $ 24,973