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Investments (Details 4) (USD $) | Sep. 30, 2012 | Dec. 31, 2011
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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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