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DERIVATIVES - DERIVATIVE GAIN (LOSS) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Components of the derivative loss
Total derivative gain (loss)	$ (36,224)	$ (10,670)	$ (133,613)	$ 64,603
Commodity derivative
Components of the derivative loss
Total derivative cash settlement gain (loss)	(26,546)	8,627	(50,536)	42,494
Change in fair value gain (loss)	(9,678)	(19,297)	(83,077)	22,109
Total derivative gain (loss)	(36,224)	(10,670)	(133,613)	64,603
Commodity derivative | Oil contracts
Components of the derivative loss
Total derivative cash settlement gain (loss)	(19,838)	9,165	(41,454)	42,088
Commodity derivative | Gas contracts
Components of the derivative loss
Total derivative cash settlement gain (loss)	$ (6,708)	$ (538)	$ (9,082)	$ 406

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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