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Investments (AFS Fixed Maturity Securities by Contractual Maturity) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Investments [Abstract]
Due in one year or less fair value	$ 359,291
Due after one year through five years fair value	1,875,834
Due after five years through 10 years fair value	1,026,073
Due after 10 years fair value	34,815
Total AFS fixed maturity securities	$ 3,296,013	$ 2,897,373

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- Definition

Amount of available-for-sale debt securities at fair value maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year.

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