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FINANCIAL DERIVATIVE INSTRUMENTS - Summary of Gain or Loss Recognized in AOCI (Details) - Commodity swap contracts - Cash Flow Hedging - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]          
Amount of Gain Recognized in AOCI on Derivatives (Effective Portion, net of tax) $ 32,976   $ 32,976   $ 9,815
Amount of Gain (Loss) Reclassified from AOCI into Earnings $ 8,374 $ (2,398) $ 9,410 $ (4,183)