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Asset Retirement Obligations
 9 Months Ended
Sep. 30, 2019
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations Asset Retirement Obligations

A reconciliation of the Company's asset retirement obligations for the nine months ended September 30, 2019 is as follows (in thousands):

As of December 31, 2018
$
29,655

Liabilities incurred
2,835

Liabilities settled
(1,560
)
Disposition of properties (1)
(7,668
)
Accretion expense
1,174

Revisions to estimate
950

As of September 30, 2019
$
25,386

Less: Current asset retirement obligations
2,039

Long-term asset retirement obligations
$
23,347



(1)
See additional information regarding disposition of properties in Note 4.