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Income taxes - Summary of income tax expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Major components of tax expense (income) [abstract]    
Current tax expense $ 85,804 $ 69,701
Deferred tax recovery (28,229) (8,477)
Income tax expense $ 57,575 $ 61,224