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Investments (HTM Fixed Maturity Securities by Contractual Maturity) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Investments [Abstract]    
Due in one year or less Carrying Value $ 72,099  
Due after one year through five years Carrying Value 312,318  
Due after five years through 10 years Carrying Value 34,747  
Due after 10 years Carrying Value 2,798  
Total HTM fixed maturity securities Carrying Value 421,962 554,069
Due in one year or less Fair Value 74,953  
Due after one year through five years Fair Value 331,927  
Due after five years through 10 years Fair Value 38,176  
Due after 10 years Fair Value 3,473  
Total HTM fixed maturity securities Fair Value $ 448,529 $ 594,661