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Asset Retirement Obligations
6 Months Ended
Jun. 30, 2020
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations Asset Retirement Obligations
A reconciliation of the Company’s asset retirement obligations for the six months ended June 30, 2020 is as follows (in thousands):

As of December 31, 2019$25,709  
Liabilities incurred488  
Liabilities settled(766) 
Disposition of properties(143) 
Accretion expense872  
Revisions to estimate409  
As of June 30, 2020$26,569  
Less: Current asset retirement obligations2,619  
Long-term asset retirement obligations$23,950