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FAIR VALUE MEASUREMENT - Energy swap contracts (Details) - WTI oil swap contracts $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) $ / bbl bbl | Dec. 31, 2016 USD ($)
Financial Instruments |  |
Unrealized gain (loss) on derivative instruments | $ | $ 9.8 | $ 9.6
2018 |  |
Financial Instruments |  |
WTI oil swap contracts (barrels) | bbl | 907,482 |
Average price | $ / bbl | 48.48 |
2019 |  |
Financial Instruments |  |
WTI oil swap contracts (barrels) | bbl | 594,451 |
Average price | $ / bbl | 49.86 |
2020 |  |
Financial Instruments |  |
WTI oil swap contracts (barrels) | bbl | 90,000 |
Average price | $ / bbl | 52.40 |
From 2017 to 2020 |  |
Financial Instruments |  |
WTI oil swap contracts (barrels) | bbl | 1,048,000 |
Average price | $ / bbl | 49.46 |

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