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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Fixed income securities, amortized cost $ 4,751,824 $ 5,346,897
Fixed income securities pledged as collateral, amortized cost 265,517 261,958
Short-term investments, amortized cost 661,219 783,015
Preferred stock, par value $ 0.01 $ 0.01
Preferred stock, shares authorized 4,000,000 4,000,000
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 650,000,000 650,000,000
Common stock, shares issued 308,016,764 308,016,764
Common stock, shares outstanding 308,016,764 308,016,764
Treasure stock, shares 5,580,657 5,587,953
Variable interest entity [Member]
    
Loans, fair value 15,359,073 14,126,994
Long-term debt, fair value $ 15,200,538 $ 14,039,450