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FINANCIAL RISK MANAGEMENT - Sensitivity Analysis of Currency Risk (Details) - Currency risk - USD ($) $ in Thousands | 12 Months Ended
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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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