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FINANCIAL RISK MANAGEMENT - Sensitivity Analysis of Currency Risk (Details) - Currency risk - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Disclosure of nature and extent of risks arising from financial instruments [line items]
Sensitivity analysis for types of market risk, reasonably possible change in risk variable, percent	10.00%
Canadian dollar
Disclosure of nature and extent of risks arising from financial instruments [line items]
Sensitivity analysis for types of market risk, reasonably possible change in risk variable, Impact on OCI	$ 701	$ 101
Argentine peso
Disclosure of nature and extent of risks arising from financial instruments [line items]
Sensitivity analysis for types of market risk, reasonably possible change in risk variable, Impact on OCI	$ 1,460	$ 476

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Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Change In Risk Variable, Impact On Other Comprehensive Income

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