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SUPPLEMENTAL OIL AND GAS INFORMATION (UNAUDITED) - Average Prices (Details) | 12 Months Ended
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Dec. 31, 2020 $ / bbl $ / Mcf | Dec. 31, 2019 $ / bbl $ / Mcf | Dec. 31, 2018 $ / bbl $ / Mcf
Natural Gas |  |  |
Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items] |  |  |
Average sales price | $ / Mcf | 1.64 | 2.35 | 2.58
Crude Oil |  |  |
Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items] |  |  |
Average sales price | 32.53 | 55.80 | 65.21
Natural Gas Liquids |  |  |
Oil and Gas, Average Sale Price and Production Cost Per Unit [Line Items] |  |  |
Average sales price | 0 | 0 | 21.64

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- Definition Sales price per unit of oil and gas produced. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1204 -Paragraph (b) -Subparagraph (1) + Details
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