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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
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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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