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Investments (Fixed Income Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Fixed Income Securities [Line Items] |  |
Due in one year or less fair value, AFS | $ 231,898 |
Due after one year through five years fair value, AFS | 1,931,022 |
Due after five years through 10 years fair value, AFS | 2,742,707 |
Due after 10 years fair value, AFS | 236,010 |
AFS, Fair Value | 5,141,637 | $ 5,162,522
Due in one year or less carrying value, HTM | 10,888 |
Due after one year through five years carrying value, HTM | 27,710 |
Due after five years through 10 years carrying value, HTM | 2,989 |
Due after 10 years carrying value, HTM | 0 |
HTM, Carrying Value | 41,587 | 42,129
Due in one year or less fair value, HTM | 10,979 |
Due after one year through five years fair value, HTM | 29,226 |
Due after five years through 10 years fair value, HTM | 3,058 |
Due after 10 years fair value, HTM | 0 |
HTM, Fair Value | $ 43,263 | $ 44,100

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