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FINANCIAL RISK MANAGEMENT - Credit Risk (Details) - Credit risk - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | $ 510,866 | $ 397,472
Cash and cash equivalents |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | 459,864 | 327,127
Value added tax receivable |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | 13,755 | 19,993
Trade receivables and other assets |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | 14,848 | 36,236
Other financial assets |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | $ 22,399 | $ 14,116

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- Definition The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 35K -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35K_a&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 36 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_36_a&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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