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Asset Retirement Obligations (Tables)
12 Months Ended
Dec. 31, 2018
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Change in Asset Retirement Obligations
The following provides a reconciliation of activity in the asset retirement obligations for the years ended December 31, 2018 and 2017:
 
 
Year Ended December 31,
In thousands
 
2018
 
2017
Beginning asset retirement obligations
 
$
5,649

 
$
2,683

Wells drilled during the year
 
408

 
220

Wells acquired during the year
 
223

 
2,797

Accretion expense
 
215

 
139

Revisions in estimated retirement obligations(1)
 
790

 
(190
)
Wells plugged and abandoned during the year
 
(90
)
 

Ending asset retirement obligations
 
$
7,195

 
$
5,649

(1)
Revisions of previous estimates during the year ended December 31, 2018 are primarily attributable to changes in estimates of the amount of future costs for oilfield services required to plug and abandon wells.