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Consolidated Balance Sheets (Parenthetical) (Unaudited) (USD $)
In Thousands, except Share data, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Consolidated Balance Sheets [Abstract]    
Amortized cost $ 2,301,303 $ 2,130,029
Preferred stock, par value      
Preferred stock, shares authorized 20,000,000 20,000,000
Preferred stock, share issued      
Preferred stock, shares outstanding      
Common stock, par value      
Common stock, shares authorized 225,000,000 225,000,000
Common stock, shares issued 104,707,012 104,482,271
Common stock, share outstanding 104,707,012 104,482,271