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FINANCIAL RISK MANAGEMENT - Market Currency Risk (Details) - Currency risk - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Canadian dollar
Disclosure of nature and extent of risks arising from financial instruments [line items]
Risk exposure	$ (11,269)	$ (1,361)
Canadian dollar | Cash
Disclosure of nature and extent of risks arising from financial instruments [line items]
Risk exposure	5,342	15,325
Canadian dollar | Value added tax receivable
Disclosure of nature and extent of risks arising from financial instruments [line items]
Risk exposure	206	398
Canadian dollar | Other financial assets
Disclosure of nature and extent of risks arising from financial instruments [line items]
Risk exposure	200	0
Canadian dollar | Trade and other payables (excluding VAT and income taxes)
Disclosure of nature and extent of risks arising from financial instruments [line items]
Risk exposure	(17,017)	(17,084)
Canadian dollar | Provisions
Disclosure of nature and extent of risks arising from financial instruments [line items]
Risk exposure	0	0
Argentine peso
Disclosure of nature and extent of risks arising from financial instruments [line items]
Risk exposure	(21,959)	7,065
Argentine peso | Cash
Disclosure of nature and extent of risks arising from financial instruments [line items]
Risk exposure	17,223	11,858
Argentine peso | Value added tax receivable
Disclosure of nature and extent of risks arising from financial instruments [line items]
Risk exposure	12,242	17,826
Argentine peso | Other financial assets
Disclosure of nature and extent of risks arising from financial instruments [line items]
Risk exposure	884	1,184
Argentine peso | Trade and other payables (excluding VAT and income taxes)
Disclosure of nature and extent of risks arising from financial instruments [line items]
Risk exposure	(5,021)	(16,474)
Argentine peso | Provisions
Disclosure of nature and extent of risks arising from financial instruments [line items]
Risk exposure	$ (47,287)	$ (7,329)

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The amount of risk exposure associated with financial instruments with a shared characteristic that identifies a concentration of risks. [Refer: Financial instruments, class [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2017-01-01
-Paragraph B8
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_B8_c&doctype=Appendix&seq=2
-URIDate 2017-03-09

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