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DERIVATIVE INSTRUMENTS (Gain and Loss on Derivative Instruments) (Details) - USD ($) $ in Thousands | 1 Months Ended | 2 Months Ended | 3 Months Ended | 5 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 30, 2021 | May 17, 2021 | Jun. 30, 2020 | May 17, 2021 | Jun. 30, 2020
Derivative [Line Items] |  |  |  |  |
Net (loss) gain on natural gas, oil and NGL derivatives | $ (139,658) | $ (107,261) | $ 26,971 | $ (137,239) | $ 125,237
Natural gas derivatives |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Net (loss) gain on natural gas, oil and NGL derivatives | (126,953) | (101,029) | 35,689 | (126,442) | 81,542
Oil derivatives |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Net (loss) gain on natural gas, oil and NGL derivatives | (5,357) | (4,395) | (7,937) | (6,126) | 44,937
NGL derivatives |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Net (loss) gain on natural gas, oil and NGL derivatives | (7,348) | $ (1,837) | $ (781) | (4,671) | 139
Contingent consideration arrangement |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Net (loss) gain on natural gas, oil and NGL derivatives | $ 0 |  |  | $ 0 | $ (1,381)

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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5618551-113959 + Details
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