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Investments (HTM Fixed Maturity Securities by Contractual Maturity) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Due in one year or less Carrying Value | $ 103,671 |
Due after one year through five years Carrying Value | 399,560 |
Due after five years through 10 years Carrying Value | 44,255 |
Due after 10 years Carrying Value | 6,583 |
Total HTM fixed maturity securities Carrying Value | 554,069 | 712,348
Due in one year or less Fair Value | 108,524 |
Due after one year through five years Fair Value | 428,480 |
Due after five years through 10 years Fair Value | 49,635 |
Due after 10 years Fair Value | 8,022 |
Total HTM fixed maturity securities Fair Value | $ 594,661 |

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