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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

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- 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=121577467&loc=d3e76258-113986 + Details
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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
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