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Investments (Details 1) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Available For Sale Securities Debt Maturities Amortized Cost
Due in one year or less	$ 426,022
Due after one year through five years	3,613,328
Due after five year through ten years	6,893,971
Due after ten years	5,454,072
Asset and mortgage-backed securities	3,369,928
Total	19,757,321	19,559,432
Available For Sale Securities Debt Maturities Fair Value
Due in one year or less	432,495
Due after one year through five years	3,773,306
Due after five year through ten years	7,127,743
Due after ten years	6,466,762
Asset and mortgage-backed securities	3,483,910
Total	$ 21,284,216	$ 22,291,614

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