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DERIVATIVE INSTRUMENTS (Net (Loss) Gain on Derivative Instruments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Derivative [Line Items] |  |  |  |
Net (loss) gain on natural gas, oil and NGL derivatives | $ (53,823) | $ 27,074 | $ 71,414 | $ 178,169
Natural gas derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Net (loss) gain on natural gas, oil and NGL derivatives | (52,648) | 11,731 | 28,894 | 147,774
Oil derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Net (loss) gain on natural gas, oil and NGL derivatives | (782) | 12,736 | 44,155 | 24,153
NGL derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Net (loss) gain on natural gas, oil and NGL derivatives | (393) | 3,641 | (254) | 7,276
Contingent consideration arrangement |  |  |  |
Derivative [Line Items] |  |  |  |
Net (loss) gain on natural gas, oil and NGL derivatives | $ 0 | $ (1,034) | $ (1,381) | $ (1,034)

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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=121590274&loc=SL5618551-113959 + Details
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