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FINANCIAL RISK MANAGEMENT - Narrative (Details) |  | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 | Dec. 31, 2018 USD ($) $ / $ $ / liter $ / gal | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |
Tax moratorium liability, interest rate | 1.50% |  |  |
Borrowings |  | $ 250,729,000 | $ 236,358,000 | $ 223,211,000
Letter of Credit |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |
Borrowings |  | 8,000,000 | 7,700,000 |
Surety Bonds |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |
Borrowings |  | $ 54,053,000 | 61,186,000 |
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 |  | $ 2,555,000 | 9,861,000 |
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) |  | $ 891,000 | 987,000 |
Commodity price risk | Gulf Coast diesel index commodity swaps and options |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |
Average hedging price | $ / gal |  | 1.56 |  |
Mark-to-market gain (loss) on hedging instrument |  |  | 117,000 |
Commodity price risk | US New York Harbour diesel index |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |
Average hedging price | $ / liter |  | 0.44 |  |
Mark-to-market gain (loss) on hedging instrument |  | $ (144,000) | 0 |
Currency risk |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |
Average hedging price | $ / $ |  | 1.36 |  |
Sensitivity analysis for types of market risk, reasonably possible change in risk variable, percent |  | 10.00% |  |
Mark-to-market gain (loss) on hedging instrument |  | $ (1,572,000) | $ 412,000 |
Currency risk | Argentine peso |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |
Percentage of increase (decrease) in value of currency |  | (102.00%) | (17.00%) |
Currency risk | Canadian dollar |  |  |  |
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |
Percentage of increase (decrease) in value of currency |  | 9.00% | (7.00%) |
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) |  | $ 3,372,000 | $ 2,368,000 |
Tax moratorium liability, interest rate |  |  | 1.50% |
Weighted average interest rate earned on cash and cash equivalent |  |  | 0.97% |

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