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Investments (Details 4) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Available For Sale Securities Debt Maturities Amortized Cost
Due in one year or less	$ 247,507,000
Due after one year through five years	3,767,244,000
Due after five year through ten years	6,172,841,000
Due after ten years	5,484,692,000
Asset and mortgage-backed securities	3,232,999,000
Total	18,905,283,000	14,182,880,000
Available For Sale Securities Debt Maturities Fair Value
Due in one year or less	251,672,000
Due after one year through five years	3,950,306,000
Due after five year through ten years	6,757,674,000
Due after ten years	7,329,863,000
Asset and mortgage-backed securities	3,368,899,000
Total	$ 21,658,414,000	$ 16,200,950,000

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