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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, 2018 USD ($) item $ / bbl bbl | Dec. 31, 2017 USD ($)
Financial Instruments |  |
Unrealized gain (loss) on derivative instruments | $ | $ (7.5) | $ 9.8
2019 |  |
Financial Instruments |  |
WTI oil swap contracts (barrels) | 864,451 |
Average price | item | 51.73 |
2020 |  |
Financial Instruments |  |
WTI oil swap contracts (barrels) | 590,400 |
Average price | item | 56.21 |
2021 |  |
Financial Instruments |  |
WTI oil swap contracts (barrels) | 174,000 |
Average price | item | 58.84 |
2020, 2021 |  |
Financial Instruments |  |
WTI oil swap contracts (barrels) | 944,400 |
Average price | $ / bbl | 56.95 |

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