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v3.20.4

Supplemental Gas Data (unaudited) - Average Unit Prices and Average Production Costs (Details) Mcfe in Thousands | 12 Months Ended
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Dec. 31, 2020 usd_per_mcfe Mcfe | Dec. 31, 2019 usd_per_mcfe Mcfe | Dec. 31, 2018 usd_per_mcfe Mcfe
Average Sales Price and Production Costs Per Unit of Production [Line Items] (Deprecated 2019-01-31) |  |  |
Production (MMcfe) | Mcfe | 511,072 | 539,149 | 507,104
Natural Gas, Per Thousand Cubic Feet |  |  |
Average Sales Price and Production Costs Per Unit of Production [Line Items] (Deprecated 2019-01-31) |  |  |
Total Average Sales Price Before Effects of Commodity Derivative Financial Settlements (per Mcfe) | 1.75 | 2.53 | 3.11
Average Effects of Commodity Derivative Financial Settlements (per Mcfe) | 0.74 | 0.14 | (0.15)
Total Average Sales Price Including Effects of Commodity Derivative Financial Settlements (per Mcfe) | 2.49 | 2.66 | 2.97
Average Lifting Costs, Excluding Ad Valorem and Severance Taxes (per Mcfe) | 0.08 | 0.12 | 0.19

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- Definition Energy measure of decrease in quantity of proved reserve of oil and gas resulting from production, stated in a unit of energy. For example, but not limited to, barrel of oil equivalents (BOE) or one thousand cubic feet of natural gas equivalent (Mcfe). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Form 20-F -Section Item 18 -Subsection Instruction 2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 5 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61831-109447 + Details
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