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COST OF SALES (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Analysis of income and expense [abstract] |  |  |
Inventories at the beginning of the year | $ 2,550,930 | $ 1,647,869 | $ 1,579,120
Acquisition of business (Note 3) | 0 | 400,047 | 0
Effect of initial inflation adjustment | 191,708 | 0 | 0
Translation differences | (413,436) | (97,148) | (82,515)
Raw materials and consumables used and other movements | 6,961,704 | 6,337,283 | 4,060,783
Services and fees | 158,551 | 110,949 | 77,698
Labor cost | 699,447 | 673,821 | 560,513
Depreciation of property, plant and equipment | 456,522 | 348,415 | 314,649
Amortization of intangible assets | 25,374 | 35,275 | 40,225
Maintenance expenses | 519,625 | 480,496 | 457,734
Office expenses | 8,586 | 7,350 | 7,112
Insurance | 8,769 | 7,968 | 8,432
Charge of obsolescence allowance | 17,322 | (4,028) | 4,600
Recovery from sales of scrap and by-products | (27,744) | (25,973) | (21,010)
Others | 15,799 | 31,631 | 24,918
Less: Inventories at the end of the year | (2,689,829) | (2,550,930) | (1,647,869)
Cost of Sales | $ 8,483,328 | $ 7,403,025 | $ 5,384,390

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