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Provisions and other non-financial liabilities (Details 4) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of Provisions and other non-financial liabilities [Line Items]      
Total provisions, initial balance $ 93,446 $ 50,846 $ 40,402
Changes in provisions:      
Additional provisions 99,336 60,923 57,110
Provision used (54,778) (18,338) (1,061)
Increase(decrease) in foreign currency exchange 0 9 128
others 15 6 467
Total Increase (decreases) 44,573 42,600 10,444
Total provisions, final balance 138,019 93,446 50,846
Legal proceedings provision [member]      
Disclosure of Provisions and other non-financial liabilities [Line Items]      
Total provisions, initial balance 19,419 23,867 21,067
Changes in provisions:      
Additional provisions 1,000 6,352 2,800
Provision used (5,557) (10,800) 0
Increase(decrease) in foreign currency exchange 0 0 0
others 0 0 0
Total Increase (decreases) (4,557) (4,448) 2,800
Total provisions, final balance 14,862 19,419 23,867
Provision for decommissioning, restoration and rehabilitation costs [member]      
Disclosure of Provisions and other non-financial liabilities [Line Items]      
Total provisions, initial balance 26,954 5,890 5,890
Changes in provisions:      
Additional provisions 1,820 21,064 0
Provision used 0 0 0
Increase(decrease) in foreign currency exchange 0 0 0
others 48 0 0
Total Increase (decreases) 1,868 21,064 0
Total provisions, final balance 28,822 26,954 5,890
Miscellaneous other provisions [member]      
Disclosure of Provisions and other non-financial liabilities [Line Items]      
Total provisions, initial balance 47,073 21,089 13,445
Changes in provisions:      
Additional provisions 96,516 33,507 54,310
Provision used (49,221) (7,538) (47,261)
Increase(decrease) in foreign currency exchange 0 9 128
others (33) 6 467
Total Increase (decreases) 47,262 25,984 7,644
Total provisions, final balance $ 94,335 $ 47,073 $ 21,089