Quarterly report pursuant to Section 13 or 15(d)

Asset Retirement Obligations (Summary of Changes in Asset Retirement Obligations) (Details)

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Asset Retirement Obligations (Summary of Changes in Asset Retirement Obligations) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Asset Retirement Obligations [Abstract]    
Beginning balance $ 40,694 $ 17,334
Accretion 473 1,627
Additions   14,564
Revisions   7,169
Ending balance $ 41,167 $ 40,694