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Investments (Fixed Income Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Fixed Income Securities [Line Items] |  |
Due in one year or less fair value, AFS | $ 336,142 |
Due after one year through five years fair value, AFS | 3,714,414 |
Due after five years through 10 years fair value, AFS | 1,960,132 |
Due after 10 years fair value, AFS | 426,849 |
AFS, Fair Value | 6,437,537 | $ 6,095,620
Due in one year or less carrying value, HTM | 1,456 |
Due after one year through five years carrying value, HTM | 15,131 |
Due after five years through 10 years carrying value, HTM | 2,500 |
Due after 10 years carrying value, HTM | 0 |
HTM, Carrying Value | 19,087 | 20,800
Due in one year or less fair value, HTM | 1,490 |
Due after one year through five years fair value, HTM | 16,293 |
Due after five years through 10 years fair value, HTM | 2,430 |
Due after 10 years fair value, HTM | 0 |
HTM, Fair Value | $ 20,213 | $ 21,975

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