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Investments (AFS Fixed Maturity Securities by Contractual Maturity) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Investments [Abstract]
Due in one year or less fair value	$ 352,423
Due after one year through five years fair value	1,861,652
Due after five years through 10 years fair value	841,420
Due after 10 years fair value	67,511
Total AFS fixed maturity securities	$ 3,123,006	$ 2,897,373

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