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Investments (HTM Fixed Maturity Securities by Contractual Maturity) (Details) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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Investments [Abstract] |  |
Due in one year or less Carrying Value | $ 100,082 |
Due after one year through five years Carrying Value | 363,382 |
Due after five years through 10 years Carrying Value | 41,427 |
Due after 10 years Carrying Value | 2,880 |
Total HTM fixed maturity securities Carrying Value | 507,771 | 554,069
Due in one year or less Fair Value | 103,261 |
Due after one year through five years Fair Value | 389,774 |
Due after five years through 10 years Fair Value | 46,831 |
Due after 10 years Fair Value | 3,687 |
Total HTM fixed maturity securities Fair Value | $ 543,553 |

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