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Related parties - Transactions with related entities that affected results (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues      
Demurrage     $ 524
Reimbursement     76
Total revenues     600
Expenses      
Supplies $ 55 $ 9 44
Sociedad Minera Cerro Verde S.A.A. [Member]      
Revenues      
Supplies 768    
Demurrage 226 688  
Reimbursement   491  
Total revenues 994 1,179  
Expenses      
Reimbursement of information technology services 15,900 11,533 11,836
Commissions 7,801 8,953 8,292
Stock-based compensation (a) [1] 2,259 1,560 1,174
Management fee 2,159 2,923 2,743
Supplies 492 908 1,133
Fixed assets and spare parts     14,265
Total expenses $ 28,611 $ 25,877 $ 39,443
[1] As indicated in the table above, during 2020, 2019 and 2018 stock-based compensation expense totaled US$2.3 million, US$1.6 million and US$1.2 million and the related payments/vesting totaled US$0.8 million, US$0.4 million and US$0.5