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Investments (Details 1) (USD $) | Mar. 31, 2013 | Dec. 31, 2012
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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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