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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

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