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Investments (HTM Fixed Maturity Securities by Contractual Maturity) (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
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Investments [Abstract] |  |
Due in one year or less Carrying Value | $ 93,387 |
Due after one year through five years Carrying Value | 348,188 |
Due after five years through 10 years Carrying Value | 35,044 |
Due after 10 years Carrying Value | 2,888 |
Total HTM fixed maturity securities Carrying Value | 479,507 | 554,069
Due in one year or less Fair Value | 96,086 |
Due after one year through five years Fair Value | 369,227 |
Due after five years through 10 years Fair Value | 38,777 |
Due after 10 years Fair Value | 3,535 |
Total HTM fixed maturity securities Fair Value | $ 507,625 |

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