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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Consolidated Balance Sheets [Abstract]      
Fixed maturities, available for sale, amortized cost $ 4,984,389 $ 4,533,233  
Equity securities, available for sale, cost $ 23,070 $ 20,765  
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
Common stock, shares authorized 75,000,000 75,000,000  
Common stock, shares issued 61,803,462 61,469,148  
Treasury stock, shares 22,028,030 21,813,196 21,813,196