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Investments (Fixed Income Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule of Fixed Income Securities [Line Items] |  |
Due in one year or less fair value, AFS | $ 453,772 |
Due after one year through five years fair value, AFS | 3,400,223 |
Due after five years through 10 years fair value, AFS | 2,043,563 |
Due after 10 years fair value, AFS | 624,083 |
Total AFS fixed income securities, Fair Value | 6,521,641 | $ 6,455,928
Due in one year or less carrying value, HTM | 1,057 |
Due after one year through five years carrying value, HTM | 14,433 |
Due after five years through 10 years carrying value, HTM | 8,854 |
Due after 10 years carrying value, HTM | 0 |
Total HTM fixed income securities carrying value | 24,344 | 16,824
Due in one year or less fair value, HTM | 1,065 |
Due after one year through five years fair value, HTM | 15,325 |
Due after five years through 10 years fair value, HTM | 8,814 |
Due after 10 years fair value, HTM | 0 |
Total HTM fixed income securities, Fair Value | $ 25,204 | $ 18,001

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