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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
AFS due in one year or less fair value $ 315,857  
AFS due after one year through five years fair value 2,099,529  
AFS due after five years through 10 years fair value 2,510,294  
AFS due after 10 years fair value 236,842  
Fixed income securities, available-for-sale securities 5,162,522 $ 4,792,540
HTM due in one year or less carrying value 10,997  
HTM due after one year through five years carrying value 23,035  
HTM due after five years through 10 years carrying value 8,097  
HTM due after 10 years carrying value 0  
Total HTM fixed income securities carrying value 42,129 101,556
HTM due in one year or less fair value 11,168  
HTM due after one year through five years fair value 24,235  
HTM due after five years through 10 years fair value 8,697  
HTM due after 10 years fair value 0  
Total HTM fixed income securities fair value $ 44,100 $ 105,211