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COST OF SALES (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Analysis of income and expense [abstract] |  |  |
Inventories at the beginning of the year | $ (1,647,869) | $ (1,579,120) | $ (2,134,034)
Acquisition of business (Note 3) | 400,047 | 0 | 0
Translation differences | (97,148) | (82,515) | (204,512)
Raw materials and consumables used and other movements | 6,337,283 | 4,060,783 | 4,548,219
Services and fees | 110,949 | 77,698 | 86,874
Labor cost | 673,821 | 560,513 | 599,989
Depreciation of property, plant and equipment | 348,415 | 314,649 | 335,302
Amortization of intangible assets | 35,275 | 40,225 | 48,442
Maintenance expenses | 480,496 | 457,734 | 507,895
Office expenses | 7,350 | 7,112 | 6,683
Insurance | 7,968 | 8,432 | 9,435
(Recovery) Charge of obsolescence allowance | (4,028) | 4,600 | (4,816)
Recovery from sales of scrap and by-products | (25,973) | (21,010) | (31,096)
Others | 31,631 | 24,918 | 19,943
Cost of Sales | $ 7,403,025 | $ 5,384,390 | $ 6,477,272

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