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FINANCIAL RISK MANAGEMENT - Currency Risk Positions (Details) - Currency risk CAD in Thousands | Dec. 31, 2019 CAD CAD / $ | Dec. 31, 2018 CAD CAD / $ | Dec. 31, 2017 CAD / $
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Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |  |
Notional amount | CAD | CAD 8,000 | CAD 23,000 |
Estimated usage | 11.30% | 31.00% |
Hedging price (in CAD per USD) |  |  | 0.80
Floor price |  |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |  |
Hedging price (in CAD per USD) | 0.80 | 0.78 |
Cap price |  |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |  |
Hedging price (in CAD per USD) | 0.76 | 0.74 |

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