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Investments (AFS Fixed Maturity Securities by Contractual Maturity) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Investments [Abstract]
Due in one year or less fair value	$ 326,454
Due after one year through five years fair value	1,840,956
Due after five years through 10 years fair value	1,202,597
Due after 10 years fair value	49,804
Total AFS fixed maturity securities	$ 3,419,811	$ 3,296,013

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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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