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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Fixed maturities, available for sale, amortized cost $ 6,785,626 $ 6,375,237    
Equity securities, available for sale, cost $ 95,722 $ 99,904    
Preferred stock, par value $ 0.001 $ 0.001    
Preferred stock, shares authorized 1,000,000 1,000,000    
Preferred stock, shares issued 0 0    
Common stock, par value $ 0.001 $ 0.001 $ 0.001 $ 0.001
Common stock, shares authorized 75,000,000 75,000,000    
Common stock, shares issued 64,537,554 64,245,048    
Treasury stock, shares 23,971,522 23,308,430 23,117,554 22,943,925