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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2020
Asset Retirement Obligation Disclosure [Abstract]  
Summary of Asset Retirement Obligation Transactions
The following table summarizes the Company’s asset retirement obligation transactions recorded during the years ended December 31, 2020 and 2019 (in thousands):
 20202019
Beginning asset retirement obligations$2,164 $2,229 
Liabilities incurred106 105 
Property dispositions(10)(10)
Liabilities settled(195)(374)
Accretion expense307 214 
Revision of estimates655 — 
Ending asset retirement obligations$3,027 $2,164