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Investments (Fixed Income Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule of Fixed Income Securities [Line Items] |  |
Due in one year or less fair value, AFS | $ 511,751 |
Due after one year through five years fair value, AFS | 3,389,351 |
Due after five years through 10 years fair value, AFS | 2,101,275 |
Due after 10 years fair value, AFS | 674,693 |
Total AFS fixed income securities, Fair Value | 6,677,070 | $ 6,455,928
Due in one year or less carrying value, HTM | 32 |
Due after one year through five years carrying value, HTM | 14,548 |
Due after five years through 10 years carrying value, HTM | 10,672 |
Due after 10 years carrying value, HTM | 0 |
Total HTM fixed income securities carrying value | 25,252 | 16,824
Due in one year or less fair value, HTM | 33 |
Due after one year through five years fair value, HTM | 15,340 |
Due after five years through 10 years fair value, HTM | 10,664 |
Due after 10 years fair value, HTM | 0 |
Total HTM fixed income securities, Fair Value | $ 26,037 | $ 18,001

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