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Asset Retirement Obligations
 9 Months Ended
Sep. 30, 2018
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligations
Asset Retirement Obligations
The Company has asset retirement obligations associated with the future plugging and abandonment of oil and gas properties and related facilities. Revisions to the liability typically occur due to changes in the estimated abandonment costs, well economic lives, and the discount rate.
The following table summarizes the Company’s asset retirement obligation transactions recorded during the nine months ended September 30, (in thousands): 
 
 
2018
 
2017
Beginning asset retirement obligations
 
$
2,354

 
$
6,013

Liabilities incurred
 
63

 
64

Liabilities settled
 
(79
)
 
—

Acquisitions
 
—

 
359

Accretion expense
 
128

 
378

Divestitures
 
(649
)
 
(3,629
)
Revision of estimates
 
(182
)
 
19

Ending asset retirement obligations
 
$
1,635

 
$
3,204