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Investments (Fixed Maturity Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
AFS due in one year or less fair value | $ 433,241 |
AFS due after one year through five years fair value | 3,639,658 |
AFS due after five years through 10 years fair value | 1,910,480 |
AFS due after 10 years fair value | 472,549 |
Fixed income securities, available-for-sale securities | 6,455,928 | $ 6,095,620
HTM due in one year or less carrying value | 1,132 |
HTM due after one year through five years carrying value | 15,692 |
HTM due after five years through 10 years carrying value | 0 |
HTM due after 10 years carrying value | 0 |
Total HTM fixed income securities carrying value | 16,824 | 20,800
HTM due in one year or less fair value | 1,149 |
HTM due after one year through five years fair value | 16,852 |
HTM due after five years through 10 years fair value | 0 |
HTM due after 10 years fair value | 0 |
Total HTM fixed income securities fair value | $ 18,001 | $ 21,975

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