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Investments (AFS 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 fair value $ 324,743  
Due after one year through five years fair value 1,951,770  
Due after five years through 10 years fair value 1,329,795  
Due after 10 years fair value 27,124  
Total AFS fixed maturity securities $ 3,633,432 $ 3,296,013