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Supplemental Gas Data (unaudited) Average Unit Prices and Average Production Costs (Details) Mcfe in Thousands | 12 Months Ended
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Dec. 31, 2019 usd_per_mcfe Mcfe | Dec. 31, 2018 usd_per_mcfe Mcfe | Dec. 31, 2017 usd_per_mcfe Mcfe
Average Sales Price and Production Costs Per Unit of Production [Line Items] (Deprecated 2019-01-31) |  |  |
Production (MMcfe) | Mcfe | 539,149 | 507,104 | 407,166
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) | 2.53 | 3.11 | 2.76
Average Effects of Commodity Derivative Financial Settlements (per Mcfe) | 0.14 | (0.15) | (0.11)
Total Average Sales Price Including Effects of Commodity Derivative Financial Settlements (per Mcfe) | 2.66 | 2.97 | 2.66
Average Lifting Costs, Excluding Ad Valorem and Severance Taxes (per Mcfe) | 0.12 | 0.19 | 0.22

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