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Cost of sales, without considering depreciation and amortization (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cost of production      
Other production expenses $ 13,595 $ 15,028 $ 24,107,000
Cost of sales of goods, excluding depreciation and amortization (982,957) (980,254) (824,973)
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 37,640 58,633 69,932
Cost of production      
Services provided by third parties 245,705 262,195 211,325
Consumption of materials and supplies 136,991 134,070 100,401
Direct labor 96,612 87,886 72,344
Electricity and water 51,226 44,345 41,989
Transport 24,805 16,254 10,880
Maintenance and repair 24,459 22,839 17,792
Rentals 31,156 26,591 10,852
Insurances 11,550 6,637 4,347
Provision (reversal) for impairment of finished goods and product in progress, note 8(c) 4,521 2,118 (7,581)
Cost of concentrate purchased to associates 0 439 2,958
Other production expenses 10,025 10,464 9,789
Total cost of production of the period 637,050 613,838 475,096
Final balance of products in process and finished goods, net of depreciation and amortization $ (49,206) $ (45,038) $ (47,216)