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Insurance Operations (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Change in liability for unpaid losses and LAE        
Balance at beginning of period $ 193,241 $ 187,215    
Less reinsurance recoverable     (81,415) (88,002)
Net balance at beginning of period 111,826 99,213    
Incurred related to Current year 26,654 26,350    
Incurred related to Prior years (171) (176)    
Total incurred 26,483 26,174    
Paid related to Current year 1,172 953    
Paid related to Prior years 30,289 31,419    
Total paid 31,461 32,372    
Net balance at end of period 106,848 93,015    
Plus reinsurance recoverables 75,680 79,285    
Balance at end of period $ 182,528 $ 172,300