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Supplemental Gas Data (unaudited) - Average Unit Prices and Average Production Costs (Details)
Mcfe in Thousands
12 Months Ended
Dec. 31, 2021
dollarsPerMcfe
Mcfe
Dec. 31, 2020
dollarsPerMcfe
Mcfe
Dec. 31, 2019
dollarsPerMcfe
Mcfe
Average Sales Price and Production Costs Per Unit of Production [Line Items] (Deprecated 2019-01-31)      
Production (MMcfe) | Mcfe 590,248 511,072 539,149
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) 3.70 1.75 2.53
Average Effects of Commodity Derivative Financial Settlements (per Mcfe) (0.98) 0.78 0.14
Total Average Sales Price Including Effects of Commodity Derivative Financial Settlements (per Mcfe) 2.79 2.49 2.66
Average Lifting Costs, Excluding Ad Valorem and Severance Taxes (per Mcfe) 0.08 0.08 0.12