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Income taxes - Reconciliation (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Income Tax Disclosure [Abstract]        
Income tax (benefit) expense $ 1,333,000 $ (3,998,000) $ 299,542,000 $ (12,251,000)