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Investments (AFS Fixed Income securities by Contractual Maturity) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Investments [Abstract]    
Due in one year or less fair value $ 401,681  
Due after one year through five years fair value 2,007,460  
Due after five years through 10 years fair value 1,404,203  
Due after 10 years fair value 76,856  
Total AFS fixed income securities $ 3,890,200 $ 3,715,536