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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