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DERIVATIVES - DERIVATIVE GAIN (LOSS) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Components of the derivative loss
Total derivative gain (loss)	$ (73,970)	$ (25,146)	$ (97,389)	$ 75,273
Commodity derivative
Components of the derivative loss
Total derivative cash settlement gain (loss)	(20,199)	22,613	(23,990)	33,867
Change in fair value gain (loss)	(53,771)	(47,759)	(73,399)	41,406
Total derivative gain (loss)	(73,970)	(25,146)	(97,389)	75,273
Commodity derivative | Oil contracts
Components of the derivative loss
Total derivative cash settlement gain (loss)	(18,794)	22,485	(21,616)	32,923
Commodity derivative | Gas contracts
Components of the derivative loss
Total derivative cash settlement gain (loss)	$ (1,405)	$ 128	$ (2,374)	$ 944

X

- Definition

Amount of gain (loss) from the increase (decrease) in fair value of derivative and nonderivative instruments designated as fair value hedging instruments recognized in the income statement.

+ References

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- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

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- Definition

The difference between the book value and the sale price of agreements to purchase or sell mineral resources, energy, and agricultural products at some future point. This element refers to the gain (loss) included in earnings and not to the cash proceeds.

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