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Related parties - Transactions with related entities that affected results (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Expenses        
Supplies $ 53 $ 55   $ 9
Sociedad Minera Cerro Verde S.A.A. [Member]        
Revenues        
Demurrage 65 226 $ 688  
Supplies   768    
Reimbursement     491  
Total revenues 65 994 1,179  
Expenses        
Reimbursement of information technology services 16,941 15,900 11,533  
Commissions 8,484 7,801 8,953  
Stock-based compensation (a) 2,894 2,259 1,560  
Management fee 2,352 2,159 2,923  
Supplies   492 908  
Total expenses 30,671 28,611 25,877  
Amounts of related payments/settlements 2,700 800 400  
Other capital contributions $ 200 $ 1,500 $ 1,200