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FINANCIAL RISK MANAGEMENT - Market Price Risk (Details) - Commodity price risk - Gulf Coast diesel index commodity swaps and options gal in Thousands | Dec. 31, 2019 gal $ / gal | Dec. 31, 2018 gal $ / gal | Dec. 31, 2017 $ / gal
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Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |  |
Gallons hedged | gal | 252 | 3,276 |
Estimated usage | 2.50% | 32.10% |
Hedging price ($/gallon) |  |  | 1.98
Floor price |  |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |  |
Hedging price ($/gallon) | 1.26 | 1.32 |
Cap price |  |  |
Disclosure of information about terms and conditions of hedging instruments and how they affect future cash flows [line items] |  |  |
Hedging price ($/gallon) | 1.90 | 1.90 |

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