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Supplemental Gas Data (unaudited) Narrative (Details) Mcf in Millions | 12 Months Ended
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Dec. 31, 2019 well Mcf | Dec. 31, 2018 well | Dec. 31, 2017 well
Extractive Industries [Abstract] |  |  |
Net development wells drilled | 75.7 | 83.9 | 90.0
Net dry development wells drilled | 1.0 | 0 | 0
Net exploratory wells drilled | 5.0 | 0 | 4.0
Net development wells drilled but uncompleted | 35.0 |  |
Exploratory wells drilled but uncompleted | 1.0 |  |
Net developmental wells completed, awaiting tie-in to production | 7.0 |  |
Gas delivery commitment, remaining contractual volume | Mcf | 532.3 |  |

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- Definition Quantity of oil and gas subject to delivery commitment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1207 -Paragraph (a) -Subparagraph (2) + Details
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