Quarterly report pursuant to Section 13 or 15(d)

Asset Retirement Obligations (Details)

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Asset Retirement Obligations (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]      
Beginning Balance $ 306 $ 0 $ 0
Liabilities acquired 3,580 0  
Liabilities incurred 0 306  
Accretion expense 18 $ 0  
Ending Balance $ 3,904   $ 306