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FAIR VALUE MEASUREMENT - Energy swap contracts (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) $ / bbl bbl | Dec. 31, 2018 USD ($)
Derivative Contracts |  |
Financial Instruments |  |
Unrealized gain (loss) recorded in AOCI | $ | $ 5.8 | $ (23.3)
Energy Swap |  |
Financial Instruments |  |
Unrealized gain (loss) recorded in AOCI | $ | $ 3.2 | $ (7.5)
Energy Swap | 2020 |  |
Financial Instruments |  |
WTI oil swap contracts (barrels) | bbl | 946,800 |
Average price | $ / bbl | 54.43 |
Energy Swap | 2021 |  |
Financial Instruments |  |
WTI oil swap contracts (barrels) | bbl | 609,000 |
Average price | $ / bbl | 52.79 |
Energy Swap | 2022 |  |
Financial Instruments |  |
WTI oil swap contracts (barrels) | bbl | 74,100 |
Average price | $ / bbl | 50.21 |
Energy Swap | From 2020 to 2022 |  |
Financial Instruments |  |
WTI oil swap contracts (barrels) | bbl | 865,500 |
Average price | $ / bbl | 50.81 |

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