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Investments (AFS Fixed Maturity Securities by Contractual Maturity) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Investments [Abstract]
Due in one year or less fair value	$ 321,292
Due after one year through five years fair value	1,876,518
Due after five years through 10 years fair value	810,211
Due after 10 years fair value	26,490
Total AFS fixed maturity securities	$ 3,034,511	$ 2,897,373

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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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