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Provisions and other non-financial liabilities (Details 3) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Provisions and other non-financial liabilities [Line Items]      
Total provisions, initial balance $ 145,255 $ 138,019 $ 93,446
Changes in provisions:      
Additional provisions 154,581 154,425 184,064
Provision used (127,624) (151,581) (139,506)
Increase(decrease) in foreign currency exchange (2,482) (24) 0
Others (2,947) 4,416 15
Total Increase (decreases) 21,528 7,236 44,573
Total provisions, final balance 166,783 145,255 138,019
Legal proceedings provision [member]      
Disclosure of Provisions and other non-financial liabilities [Line Items]      
Total provisions, initial balance 14,924 14,862 19,419
Changes in provisions:      
Additional provisions 62,922 4,111 1,000
Provision used (67,685) (4,049) (5,557)
Increase(decrease) in foreign currency exchange 4 0 0
Others 0 0 0
Total Increase (decreases) (4,759) 62 (4,557)
Total provisions, final balance 10,165 14,924 14,862
Provision for decommissioning, restoration and rehabilitation costs [member]      
Disclosure of Provisions and other non-financial liabilities [Line Items]      
Total provisions, initial balance 33,238 28,822 26,954
Changes in provisions:      
Additional provisions 30,974 0 1,820
Provision used 0 0 0
Increase(decrease) in foreign currency exchange 0 0 0
Others (2,947) 4,416 48
Total Increase (decreases) 28,027 4,416 1,868
Total provisions, final balance 61,265 33,238 28,822
Miscellaneous other provisions [member]      
Disclosure of Provisions and other non-financial liabilities [Line Items]      
Total provisions, initial balance 97,093 94,335 47,073
Changes in provisions:      
Additional provisions 60,685 150,314 181,244
Provision used (59,939) (147,532) (133,949)
Increase(decrease) in foreign currency exchange (2,486) (24) 0
Others 0 0 (33)
Total Increase (decreases) (1,740) 2,758 47,262
Total provisions, final balance $ 95,353 $ 97,093 $ 94,335