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Insurance Operations (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2011
Dec. 31, 2010
Change in liability for unpaid losses and LAE                
Balance at beginning of period $ 164,625 $ 155,375 $ 187,215 $ 158,929        
Less reinsurance recoverable         73,169 88,002 76,307 79,114
Net balance at beginning of period 91,456 79,068 99,213 79,815        
Expenses incurred related to Current year 27,409 24,975 83,120 76,897        
Expenses incurred related to Prior years 8,891 4,368 8,791 4,483        
Total incurred 36,300 29,343 91,911 81,380        
Expenses paid related to Current year 18,808 15,244 34,143 30,119        
Expenses paid related to Prior years 10,434 9,587 58,467 47,496        
Total paid 29,242 24,831 92,610 77,615        
Net balance at end of period 98,514 83,580 98,514 83,580        
Plus reinsurance recoverables 74,160 79,374 74,160 79,374        
Balance at end of period $ 172,674 $ 162,954 $ 172,674 $ 162,954