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DERIVATIVE INSTRUMENTS (Net (Loss) Gain on Derivative Instruments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Derivative [Line Items] |  |  |  |
Net gain on natural gas, oil and NGL derivatives | $ 26,971 | $ 171,140 | $ 125,237 | $ 151,095
Natural gas derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Net gain on natural gas, oil and NGL derivatives | 35,689 | 152,475 | 81,542 | 136,044
Oil derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Net gain on natural gas, oil and NGL derivatives | (7,937) | 11,871 | 44,937 | 11,417
NGL derivatives |  |  |  |
Derivative [Line Items] |  |  |  |
Net gain on natural gas, oil and NGL derivatives | (781) | 6,794 | 139 | 3,634
Contingent consideration arrangement |  |  |  |
Derivative [Line Items] |  |  |  |
Net gain on natural gas, oil and NGL derivatives | $ 0 | $ 0 | $ (1,381) | $ 0

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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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