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Investments (AFS Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Due in one year or less fair value $ 472,331  
Due after one year through five years fair value 2,135,301  
Due after five years through 10 years fair value 1,733,858  
Due after 10 years fair value 66,713  
Total AFS fixed maturity securities $ 4,408,203 $ 4,066,122