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Investments (Fixed Income Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Fixed Income Securities [Line Items] |  |
Due in one year or less fair value, AFS | $ 295,885 |
Due after one year through five years fair value, AFS | 3,471,503 |
Due after five years through 10 years fair value, AFS | 1,925,970 |
Due after 10 years fair value, AFS | 252,002 |
AFS, Fair Value | 5,945,360 | $ 6,095,620
Due in one year or less carrying value, HTM | 929 |
Due after one year through five years carrying value, HTM | 13,943 |
Due after five years through 10 years carrying value, HTM | 5,508 |
Due after 10 years carrying value, HTM | 0 |
HTM, Carrying Value | 20,380 | 20,800
Due in one year or less fair value, HTM | 965 |
Due after one year through five years fair value, HTM | 15,115 |
Due after five years through 10 years fair value, HTM | 5,841 |
Due after 10 years fair value, HTM | 0 |
HTM, Fair Value | $ 21,921 | $ 21,975

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