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Changes in Fair Value Credit-linked Notes (Details) - Credit-Link Notes - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Fair Value, Option, Quantitative Disclosures [Line Items]    
Fair Value, Option, Changes in Fair Value, Gain (Loss) $ (5,404) $ (911)
Fair Value, Option, Changes in Comprehensive Income (Loss) $ 7,794 $ 0