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Investments (HTM Fixed Maturity Securities by Contractual Maturity) (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
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Investments [Abstract] |  |
Due in one year or less Carrying Value | $ 105,662 |
Due after one year through five years Carrying Value | 419,074 |
Due after five years through 10 years Carrying Value | 69,198 |
Due after 10 years Carrying Value | 6,782 |
Total HTM fixed maturity securities Carrying Value | 600,716 | 712,348
Due in one year or less Fair Value | 110,275 |
Due after one year through five years Fair Value | 449,498 |
Due after five years through 10 years Fair Value | 78,018 |
Due after 10 years Fair Value | 8,244 |
Total HTM fixed maturity securities Fair Value | $ 646,035 |

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