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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Consolidated Balance Sheets [Abstract]        
Fixed maturities, available for sale, amortized cost $ 5,311,457 $ 4,984,389    
Equity securities, available for sale, cost $ 52,396 $ 23,070    
Preferred stock, par value $ 0.001 $ 0.001    
Preferred stock, shares authorized 1,000,000 1,000,000    
Preferred stock, shares issued          
Common stock, par value $ 0.001 $ 0.001    
Common stock, shares authorized 75,000,000 75,000,000    
Common stock, shares issued 62,311,787 61,803,462    
Treasury stock, shares 22,943,925 22,028,030 21,813,196 21,813,196