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Investments (AFS Fixed Income securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Due in one year or less fair value $ 491,206  
Due after one year through five years fair value 2,403,246  
Due after five years through 10 years fair value 1,823,028  
Due after 10 years fair value 115,052  
Total AFS fixed income securities $ 4,832,532 $ 4,408,203