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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2017
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Change in Asset Retirement Obligations

The following represents a reconciliation of the asset retirement obligations:

 

 

 

Year Ended December 31,

 

In thousands

 

2017

 

 

2016

 

Asset retirement obligations at beginning of period

 

$

2,683

 

 

$

7,488

 

Wells drilled during the year

 

 

220

 

 

 

154

 

Wells acquired during the year

 

 

2,797

 

 

 

28

 

Wells sold during the year

 

 

—

 

 

 

(4,780

)

Accretion of discount

 

 

139

 

 

 

180

 

Revisions of previous estimates (1)

 

 

(190

)

 

 

(205

)

Wells plugged and abandoned during the year

 

 

—

 

 

 

(182

)

Asset retirement obligations at end of period

 

$

5,649

 

 

$

2,683

 

 

 

(1)

Revisions of previous estimates during the year ended December 31, 2017 are primarily attributable to changes in estimates of the timing of future costs for oilfield services required to plug and abandon wells.