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Investments (Fixed Income Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Fixed Income Securities [Line Items] |  |
Due in one year or less fair value, AFS | $ 280,140 |
Due after one year through five years fair value, AFS | 2,237,395 |
Due after five years through 10 years fair value, AFS | 3,065,577 |
Due after 10 years fair value, AFS | 174,786 |
AFS, Fair Value | 5,757,898 | $ 5,273,100
Due in one year or less carrying value, HTM | 9,480 |
Due after one year through five years carrying value, HTM | 16,860 |
Due after five years through 10 years carrying value, HTM | 6,024 |
Due after 10 years carrying value, HTM | 0 |
HTM, Carrying Value | 32,364 | 37,110
Due in one year or less fair value, HTM | 9,526 |
Due after one year through five years fair value, HTM | 18,109 |
Due after five years through 10 years fair value, HTM | 6,220 |
Due after 10 years fair value, HTM | 0 |
HTM, Fair Value | $ 33,855 | $ 38,317

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