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Deferred income tax - Composition of the provision for income taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of Deferred income tax [Line Items]      
Current $ (20,375) $ (9,924) $ (11,911)
Deferred 44,046 (15,506) 37,501
Total income tax 23,671 (25,430) 25,590
Income Tax Expense [Member]      
Disclosure of Deferred income tax [Line Items]      
Current (13,128) (8,446) (11,851)
Deferred 43,951 (15,270) 37,617
Total income tax 30,823 (23,716) 25,766
Mining Royalties and Special Mining Tax [Member]      
Disclosure of Deferred income tax [Line Items]      
Current (7,247) (1,478) (60)
Deferred 95 (236) (116)
Total income tax $ (7,152) $ (1,714) $ (176)