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Cost of sales, without considering depreciation and amortization (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cost of production      
Other production expenses $ 15,028 $ 24,107 $ 26,739
Cost of sales of goods, excluding depreciation and amortization (980,254) (824,973) (922,572)
cost of sales of products [Member]      
Disclosure of cost of sales [Line Items]      
Beginning balance of finished goods and products in process, net of depreciation and amortization 58,633 69,932 105,944
Cost of production      
Services provided by third parties 262,195 211,325 230,148
Consumption of materials and supplies 134,070 100,401 100,241
Direct labor 87,886 72,344 66,745
Electricity and water 44,345 41,989 34,972
Maintenance and repair 22,839 17,792 7,401
Transport 16,254 10,880 9,502
Rentals 26,591 10,852 5,783
Insurances 6,637 4,347 5,247
Cost of concentrate purchased to associates 439 2,958 0
Provision for impairment of finished goods and product in progress, note 9(b) 2,118 (7,581) 13,096
Other production expenses 10,464 9,789 7,078
Total cost of production of the period 613,838 475,096 480,213
Final balance of products in process and finished goods, net of depreciation and amortization $ (45,038) $ (47,216) $ (72,667)