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Asset Retirement Obligations Asset Retirement Obligations (Tables)
9 Months Ended
Sep. 30, 2021
Asset Retirement Obligation Disclosure [Abstract]  
Roll-forward of our asset retirement obligations
The following provides a roll-forward of our asset retirement obligations for the year ended December 31, 2020 and the nine months ended September 30, 2021 (in thousands):
Asset Retirement Obligations as of December 31, 2019$4,447 
Accretion expense354 
Liabilities incurred for new wells and facilities construction281 
Reductions due to plugged wells and facilities(103)
Revisions in estimates(5)
Asset Retirement Obligations as of December 31, 2020$4,974 
Accretion expense226 
Liabilities incurred for new wells, acquired wells and facilities construction347 
Reductions due to plugged wells and facilities(192)
Revisions in estimates(157)
Asset Retirement Obligations as of September 30, 2021$5,198