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Loss and Loss Adjustment Expenses (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Reconciliation of beginning and ending reserve balances, net of related amounts recoverable from reinsurers      
Reserves for loss and loss adjustment expenses ("LAE")/Reserves for loss and LAE at beginning of year $ 538,214 $ 532,204 $ 534,655
Less amounts recoverable from reinsurers on unpaid loss and LAE 60,937 65,536 60,435
Reserves for loss and LAE at beginning of year 477,277 466,668 474,220
Add:      
Provision for loss and LAE for claims occurring in the current year, net of reinsurance 222,393 196,269 179,022
Loss and LAE Related to Prior Periods (2,490) (6,563) (21,634)
Incurred losses during the current year, net of reinsurance 219,903 189,706 157,388
Less loss and LAE payments for claims, net of reinsurance, occurring during:      
Current year 50,423 53,213 47,385
Prior years 131,497 125,884 117,555
Less loss and LAE payments for claims, net of reinsurance 181,920 179,097 164,940
Reserves for loss and LAE at ending of year 515,260 477,277 466,668
Add amounts recoverable from reinsurers on unpaid loss and LAE 55,190 60,937 65,536
Reserves for loss and LAE/Reserves for loss and LAE at end of year $ 570,450 $ 538,214 $ 532,204