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Asset Retirement Obligation (Tables)
 9 Months Ended
Sep. 30, 2019
Asset Retirement Obligation  
Reconciliation of changes in asset retirement obligation

The following table is a reconciliation of changes in ARO for the nine months ended September 30, 2019 and the year ended December 31, 2018 (in thousands):

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Nine Months Ended

 

Year Ended

 

    

September 30, 2019

    

December 31, 2018

Asset retirement obligation, beginning balance

 

$

6,200

 

$

6,074

Liabilities added from escalating working interests

 

 

172

 

 

288

Sales

 

 

 —

 

 

(613)

Revisions to cost estimates

 

 

 —

 

 

(46)

Accretion expense

 

 

391

 

 

497

Asset retirement obligation, ending balance

 

$

6,763

 

$

6,200