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FINANCIAL RISK MANAGEMENT - Narrative (Details) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2017 USD ($) $ / $ $ / gal | Dec. 31, 2016 USD ($)
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Tax moratorium liability, interest rate | 1.50% |  |
Letter of Credit |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Borrowings |  | $ 7,700 | $ 7,600
Surety Bonds |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Borrowings |  | $ 61,186 | 51,199
Commodity price risk |  |  |
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% |
Sensitivity analysis for types of market risk, reasonably possible change in risk variable, Impact on OCI |  | $ 9,861 | 12,958
Commodity price risk | Silver |  |  |
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% |
Sensitivity analysis for types of market risk, reasonably possible change in risk variable, impact on earnings (loss) |  | $ 987 | 2,918
Commodity price risk | Gulf Coast diesel index commodity swaps and options |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Hedging price ($/gallon) | $ / gal |  | 1.98 |
Mark-to-market gain (loss) on hedging instrument |  | $ 117 | 688
Fair value of hedges |  | $ 444 | 177
Hedging price (in CAD per USD) | $ / gal |  | 1.98 |
Currency risk |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Hedging price ($/gallon) | $ / $ |  | 0.80 |
Sensitivity analysis for types of market risk, reasonably possible change in risk variable, percent |  | 10.00% |
Mark-to-market gain (loss) on hedging instrument |  | $ 412 | 22
Fair value of hedges |  | $ 843 | 45
Hedging price (in CAD per USD) | $ / $ |  | 0.80 |
Currency risk | 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
Percentage of increase (decrease) in value of currency |  | (17.00%) | (22.00%)
Currency risk | 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
Percentage of increase (decrease) in value of currency |  | 7.00% | (3.00%)
Interest rate risk |  |  |
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 |  | 1.00% |
Sensitivity analysis for types of market risk, reasonably possible change in risk variable, impact on earnings (loss) |  | $ 2,368 | $ 1,538
Tax moratorium liability, interest rate |  | 1.50% |
Weighted average interest rate earned on cash and cash equivalent |  | 0.97% | 0.60%

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