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FAIR VALUE MEASUREMENT - Energy swap contracts (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($) $ / bbl bbl | Dec. 31, 2022 USD ($)
Derivative Contracts |  |
FAIR VALUE MEASUREMENT |  |
Unrealized gain (loss) recorded in AOCI | $ | $ 5.1 | $ 17.5
Energy swap contracts |  |
FAIR VALUE MEASUREMENT |  |
Unrealized gain (loss) recorded in AOCI | $ | $ 0.7 | $ 16.2
Energy swap contracts | 2024 |  |
FAIR VALUE MEASUREMENT |  |
WTI oil swap contracts (barrels) | bbl | 973,200 |
Average price | $ / bbl | 71.24 |
Energy swap contracts | 2025 |  |
FAIR VALUE MEASUREMENT |  |
WTI oil swap contracts (barrels) | bbl | 205,200 |
Average price | $ / bbl | 63.50 |
Energy swap contracts | From 2023 to 2025 |  |
FAIR VALUE MEASUREMENT |  |
WTI oil swap contracts (barrels) | bbl | 1,581,400 |
Average price | $ / bbl | 71.60 |

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