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Investments - Net gains and losses associated with the sales of marketable securities (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Investments        
Net gain/(loss) on marketable securities $ 6,143 $ 24,462 $ (57,095) $ 24,462
Less: Net gain/(loss) recognized on marketable securities sold during the period (9,119)   2,129  
Net gain/(loss) recognized on marketable securities held as of June 30, 2025 $ 15,262   $ (59,224)