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DERIVATIVE AND HEDGING ACTIVITIES - Realized Unrealized (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Derivative and hedging activities
Total net gain (loss) on derivative contracts	$ (45,711)	$ 118,299
Derivatives not designated as hedging contracts | Commodity contracts
Derivative and hedging activities
Total net gain (loss) on derivative contracts	(45,711)	118,299
Derivatives not designated as hedging contracts | Commodity contracts | Other Income Expense
Derivative and hedging activities
Unrealized gain (loss) on commodity contracts	(36,052)	112,378
Realized gain (loss) on commodity contracts	$ (9,659)	$ 5,921

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Gain (loss) incurred in hedging activities.

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The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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