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FINANCIAL RISK MANAGEMENT - Market Price Risk (Details) - Commodity price risk gal in Thousands | Dec. 31, 2019 $ / liter gal $ / gal | Dec. 31, 2018 $ / liter gal $ / gal
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Gulf Coast diesel index commodity swaps and options |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Gallons hedged | gal | 3,600 | 5,364
Estimated usage | 35.30% | 52.60%
Average hedging price | $ / gal |  | 1.56
Gulf Coast diesel index commodity swaps and options | Floor price |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Average hedging price | $ / gal | 1.75 | 1.70
Gulf Coast diesel index commodity swaps and options | Cap price |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Average hedging price | $ / gal | 2.36 | 2.34
US New York Harbour diesel index |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Gallons hedged | gal | 0 | 3,188
Estimated usage | 0.00% | 75.00%
Average hedging price | $ / liter |  | 0.44
US New York Harbour diesel index | Floor price |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Average hedging price | $ / liter | 0.00 | 0.46
US New York Harbour diesel index | Cap price |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |
Average hedging price | $ / liter | 0.00 | 0.55

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