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Investments (AFS Fixed Income securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Due in one year or less fair value $ 482,867  
Due after one year through five years fair value 2,425,517  
Due after five years through 10 years fair value 1,647,615  
Due after 10 years fair value 115,787  
Total AFS fixed income securities $ 4,671,786 $ 4,408,203