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Income tax - Analysis of income tax expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income tax      
Current year income tax expense $ (21,939) $ (15,456) $ (17,903)
Deferred income tax (expense) 22,316 67,595 (12,670)
Total income tax benefit (expense) 377 52,139 (30,573)
Deferred income tax expense, translation effect     118
Deferred income tax related to items recognized in OCI during the year      
Net gain (loss) cash flow hedges 362 (80) (274)
Remeasurement gain (loss) of employee benefits 32 (79) 138
Benefit (expense) deferred income tax recognized in OCI $ 394 $ (159) $ (136)