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Investments (AFS Fixed Maturity Securities by Contractual Maturity) (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Investments [Abstract]
Due in one year or less fair value	$ 231,400
Due after one year through five years fair value	1,800,407
Due after five years through 10 years fair value	727,331
Due after 10 years fair value	13,210
Total AFS fixed maturity securities	$ 2,772,348	$ 2,342,742

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This item represents the fair value of debt securities which are expected to mature after five years and through ten years from the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

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