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Supplemental Gas Data (unaudited) - Narrative (Details) $ in Thousands, Mcf in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 USD ($) well Mcf | Dec. 31, 2019 USD ($) well | Dec. 31, 2018 USD ($) well | Dec. 31, 2017 USD ($)
Extractive Industries [Abstract] |  |  |  |
Net development wells drilled | 29.0 | 75.7 | 83.9 |
Net dry development wells drilled | 0 | 1.0 | 0 |
Net exploratory wells drilled | 2.0 | 5.0 | 0 |
Number of net dry exploratory wells | 0 | 0 | 0 |
Net development wells drilled but uncompleted | 23.0 |  |  |
Exploratory wells drilled but uncompleted | 1.0 |  |  |
Net developmental wells completed, awaiting tie-in to production | 2.0 |  |  |
Gas delivery commitment, remaining contractual volume | Mcf | 492.5 |  |  |
Period from reserves booking for proved undeveloped locations to be fully developed | 5 years |  |  |
Number of wells pending determination of proved reserves | 1 |  |  |
Oil and Gas, Development Well Drilled [Line Items] |  |  |  |
Capitalized exploratory well costs | $ | $ 9,062 | $ 8,984 | $ 8,178 | $ 6,388
Utica |  |  |  |
Oil and Gas, Development Well Drilled [Line Items] |  |  |  |
Capitalized exploratory well costs | $ | $ 9,062 |  |  |
Number of dry wells | 1 |  |  |

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