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Investments (Fixed Income Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Fixed Income Securities [Line Items] |  |
Due in one year or less fair value, AFS | $ 186,138 |
Due after one year through five years fair value, AFS | 2,034,623 |
Due after five years through 10 years fair value, AFS | 2,733,420 |
Due after 10 years fair value, AFS | 183,472 |
AFS, Fair Value | 5,137,653 | $ 5,162,522
Due in one year or less carrying value, HTM | 8,309 |
Due after one year through five years carrying value, HTM | 27,160 |
Due after five years through 10 years carrying value, HTM | 6,547 |
Due after 10 years carrying value, HTM | 0 |
HTM, Carrying Value | 42,016 | 42,129
Due in one year or less fair value, HTM | 8,383 |
Due after one year through five years fair value, HTM | 28,544 |
Due after five years through 10 years fair value, HTM | 6,446 |
Due after 10 years fair value, HTM | 0 |
HTM, Fair Value | $ 43,373 | $ 44,100

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