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Investments (AFS Fixed Maturity Securities by Contractual Maturity) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2012 | Dec. 31, 2011
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Investments [Abstract] |  |
Due in one year or less fair value | $ 321,292 |
Due after one year through five years fair value | 1,876,518 |
Due after five years through 10 years fair value | 810,211 |
Due after 10 years fair value | 26,490 |
Total AFS fixed maturity securities | $ 3,034,511 | $ 2,897,373

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