Asset Retirement Obligations (Narrative) (Details) - USD ($) $ in Thousands |
9 Months Ended | 12 Months Ended |
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Sep. 30, 2021 |
Dec. 31, 2020 |
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| Asset Retirement Obligations [Abstract] | ||
| Additions | $ 14,564 | $ 359 |
| Revisions | $ 238 |
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- References No definition available.
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- Definition Amount of asset retirement obligations incurred during the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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