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Asset Retirement Obligations
 3 Months Ended
Mar. 31, 2020
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations Asset Retirement Obligations
A reconciliation of the Company's asset retirement obligations for the three months ended March 31, 2020 is as follows (in thousands):

As of December 31, 2019$25,709  
Liabilities incurred165  
Liabilities settled(510) 
Disposition of properties(143) 
Accretion expense429  
Revisions to estimate108  
As of March 31, 2020$25,758  
Less: Current asset retirement obligations2,351  
Long-term asset retirement obligations$23,407