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Investments (AFS Fixed Maturity Securities by Contractual Maturity) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Investments [Abstract] |  |
Due in one year or less fair value | $ 324,743 |
Due after one year through five years fair value | 1,951,770 |
Due after five years through 10 years fair value | 1,329,795 |
Due after 10 years fair value | 27,124 |
Total AFS fixed maturity securities | $ 3,633,432 | $ 3,296,013

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