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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)

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