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Investments (Details 5) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
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Available For Sale Securities Debt Maturities Amortized Cost |  |
Due in one year or less | $ 153,228 |
Due after one year through five years | 2,734,890 |
Due after five year through ten years | 4,269,704 |
Due after ten years | 5,013,266 |
Asset and mortgage-backed securities | 2,786,077 |
Total | 14,957,165 | 14,182,880
Available For Sale Securities Debt Maturities Fair Value |  |
Due in one year or less | 155,606 |
Due after one year through five years | 2,866,290 |
Due after five year through ten years | 4,695,994 |
Due after ten years | 6,658,641 |
Asset and mortgage-backed securities | 2,867,661 |
Total | $ 17,244,192 | $ 16,200,950

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