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Investments (Fixed Income Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Fixed Income Securities [Line Items] |  |
Due in one year or less fair value, AFS | $ 310,387 |
Due after one year through five years fair value, AFS | 3,296,126 |
Due after five years through 10 years fair value, AFS | 2,191,633 |
Due after 10 years fair value, AFS | 132,091 |
AFS, Fair Value | 5,930,237 | $ 5,273,100
Due in one year or less carrying value, HTM | 4,754 |
Due after one year through five years carrying value, HTM | 16,334 |
Due after five years through 10 years carrying value, HTM | 5,837 |
Due after 10 years carrying value, HTM | 0 |
HTM, Carrying Value | 26,925 | 37,110
Due in one year or less fair value, HTM | 4,773 |
Due after one year through five years fair value, HTM | 17,589 |
Due after five years through 10 years fair value, HTM | 5,994 |
Due after 10 years fair value, HTM | 0 |
HTM, Fair Value | $ 28,356 | $ 38,317

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