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Investments (Details 5) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
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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