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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)

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