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Income taxes - Summary of income tax expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Major components of tax expense (income) [abstract]    
Current tax expense $ 90,174 $ 88,575
Deferred tax expense (recovery) 49,796 (6,214)
Income tax expense $ 139,970 $ 82,361