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Investments (Fixed Income Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Schedule of Fixed Income Securities [Line Items] |  |
Due in one year or less fair value, AFS | $ 330,440 |
Due after one year through five years fair value, AFS | 2,794,530 |
Due after five years through 10 years fair value, AFS | 2,450,184 |
Due after 10 years fair value, AFS | 864,124 |
Total AFS fixed income securities, Fair Value | 6,439,278 | $ 6,709,976
Due in one year or less carrying value, HTM | 6,721 |
Due after one year through five years carrying value, HTM | 5,252 |
Due after five years through 10 years carrying value, HTM | 20,121 |
Due after 10 years carrying value, HTM | 0 |
Fixed income securities, held-to-maturity, net of allowance for credit losses | 32,094 | 28,785
Due in one year or less fair value, HTM | 6,817 |
Due after one year through five years fair value, HTM | 5,218 |
Due after five years through 10 years fair value, HTM | 19,270 |
Due after 10 years fair value, HTM | 0 |
Total HTM fixed income securities, Fair Value | $ 31,305 | $ 29,460

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