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Employee benefit expense (Tables)
12 Months Ended
Dec. 31, 2020
Classes Of Employee Benefits Expense [Abstract]  
Employee benefit expenses
20202019
Wages and salaries$226,725$238,000
Statutory and company benefits41,29941,972
Expenses related to defined benefit plans [note 25]5,2564,790
Expenses related to defined contribution plans [note 25]12,41011,767
Equity-settled share-based compensation [note 24]9,73817,469
Cash-settled share-based compensation [note 24]27,241(1,437)
Total$322,669$312,561