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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
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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For an unclassified balance sheet, this item represents investments in debt securities which are categorized as held-to-maturity. The held-to-maturity category is for those securities that the entity has the positive intent and ability to hold until maturity.

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