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FINANCIAL RISK MANAGEMENT - Credit Risk (Details) - Credit risk - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | $ 478,184 | $ 510,866
Cash and cash equivalents |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | 419,212 | 459,864
Value added tax receivable |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | 18,802 | 13,755
Trade receivables and other assets |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | $ 11,287 | 14,848
Other financial assets |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk |  | $ 22,399

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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 -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 35K -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_35K_a&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2018-01-01 -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 2018-03-16 + Details
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