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Inventories (Details 2) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Inventories [Abstract] |  |  |  |
Opening balance |  | $ 96,284 | $ 81,295 | $ 80,369
Changes |  |  |  |
Additional provisions | [1] | 3,176 | 573 | 6,071
Increase (decrease) in existing provisions | [2] | 2,436 | (178) | (6,339)
Total changes |  | 8,998 | 14,989 | 926
Increase in lower value | [3] | 7,845 | 19,515 | 2,255
Provision used, other provisions |  | (54,778) | (18,338) | (1,061)
Final Balance |  | $ 105,282 | $ 96,284 | $ 81,295
[1] | Provisions for Inventory Differences generated when physical differences are detected when taking inventory, which exceed the tolerance levels for this process. At least two annual inventories are taken in the production sites and in the port in Chile (“zero sum” systems have immediate potential adjustments).
[2] | This algorithm corresponds to diverse provision percentages based on the complexity in the measurement and rotation of stock, as well as standard differences based on previous profit and loss, as is the case with provisions in Commercial Offices.
[3] | There are three types of Lower Value Provisions: Economic Realizable Lower Value, Potential Inventory with Uncertain Future Use and Reprocessing Costs of Off-Specification Products.

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- Definition The amount used (ie incurrent and charged against the provision) for other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2018-01-01 -Paragraph 84 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2018-03-01&anchor=para_84_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of additional inventory provisions made. + References No definition available. + Details
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- References No definition available. + Details
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- Definition The amount increase or decrease in existing provisions. + References No definition available. + Details
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- Definition The increase (decrease) in inventory reserves. + References No definition available. + Details
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- Definition The amount of inventory reserves recognized. + References No definition available. + Details
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