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Investments (Details 1) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Available For Sale Securities Debt Maturities Amortized Cost
Due in one year or less	$ 348,130,000
Due after one year through five years	3,716,625,000
Due after five year through ten years	6,922,683,000
Due after ten years	5,497,340,000
Asset and mortgage-backed securities	3,354,171,000
Total	19,838,949,000	19,559,432,000
Available For Sale Securities Debt Maturities Fair Value
Due in one year or less	352,916,000
Due after one year through five years	3,917,468,000
Due after five year through ten years	7,521,433,000
Due after ten years	7,078,384,000
Asset and mortgage-backed securities	3,531,458,000
Total	$ 22,401,659,000	$ 22,291,614,000

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