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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Consolidated Balance Sheets [Abstract]    
Fixed maturities, available for sale, amortized cost $ 5,509,859 $ 5,311,457
Equity securities, available for sale, cost $ 53,117 $ 52,396
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 62,700,637 62,311,787
Treasury stock, shares 23,033,574 22,943,925