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Investments (AFS Fixed Income securities by Contractual Maturity) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Investments [Abstract]    
Due in one year or less fair value $ 425,744  
Due after one year through five years fair value 1,991,515  
Due after five years through 10 years fair value 1,345,666  
Due after 10 years fair value 52,928  
Total AFS fixed income securities $ 3,815,853 $ 3,715,536