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CURRENT AND DEFERRED INCOME TAX - Unrecognized Deductible Temporary Differences (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unrecognized deductible temporary differences | $ 600,757 | $ 642,417
Inventory |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unrecognized deductible temporary differences | 11,237 | 4,063
Property, plant and equipment |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unrecognized deductible temporary differences | 79,336 | 116,852
Close down and restoration provision |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unrecognized deductible temporary differences | 38,027 | 37,717
Carry forward tax loss and tax credits |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unrecognized deductible temporary differences | 396,830 | 420,007
Other |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [line items] |  |
Unrecognized deductible temporary differences | $ 75,327 | $ 63,778

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- Definition The amount of deductible temporary differences for which no deferred tax asset is recognised in the statement of financial position. [Refer: Temporary differences [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_e&doctype=Standard -URIDate 2017-03-09 + Details
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