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Asset Retirement Obligations (Tables)
9 Months Ended
Sep. 30, 2021
Asset Retirement Obligation Disclosure [Abstract]  
Information Related to Asset Retirement Obligations The following table reflects information related to our asset retirement obligations:
Balance at December 31, 2020$222,876 
Additions to asset retirement obligations2,363 
Revision in estimates41,363 
Accretion expense3,053 
Liabilities settled(2,631)
Balance at September 30, 2021$267,024