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FAIR VALUE MEASUREMENT - Energy swap contracts (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) $ / bbl bbl | Dec. 31, 2019 USD ($)
Derivative Contracts |  |
Financial Instruments |  |
Unrealized gain (loss) recorded in AOCI | $ | $ 2.2 | $ 5.8
Energy Swap |  |
Financial Instruments |  |
Unrealized gain (loss) recorded in AOCI | $ | $ 4.7 | $ 3.2
Energy Swap | 2021 |  |
Financial Instruments |  |
WTI oil swap contracts (barrels) | bbl | 1,054,400 |
Average price | $ / bbl | 47.52 |
Energy Swap | 2022 |  |
Financial Instruments |  |
WTI oil swap contracts (barrels) | bbl | 822,600 |
Average price | $ / bbl | 42.14 |
Energy Swap | 2023 |  |
Financial Instruments |  |
WTI oil swap contracts (barrels) | bbl | 565,200 |
Average price | $ / bbl | 39.58 |
Energy Swap | From 2021 to 2023 |  |
Financial Instruments |  |
WTI oil swap contracts (barrels) | bbl | 1,759,100 |
Average price | $ / bbl | 40.52 |

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