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Investments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Investments      
Investments - Available-for-sale $ 0 $ 98,031  
Available-for-sale investments      
Net unrealized gain (loss) on available-for-sale debt securities   $ 476 $ (533)
Net realized gain (loss) on available-for-sale debt securities $ 57