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Investments (AFS Fixed Maturity Securities by Contractual Maturity) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Investments [Abstract]
Due in one year or less fair value	$ 285,717
Due after one year through five years fair value	1,851,439
Due after five years through 10 years fair value	750,368
Due after 10 years fair value	9,849
Total AFS fixed maturity securities	$ 2,897,373	$ 2,342,742

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