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Asset Retirement Obligation (Tables)
 12 Months Ended
Dec. 31, 2017
Asset Retirement Obligation  
Reconciliation of Asset Retirement Obligation

The following table is a reconciliation of the ARO (in thousands):

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

December 31, 

 

    

2017

    

2016

Asset retirement obligation, beginning balance

 

$

13,579

 

$

20,364

Liabilities added from acquisitions

 

 

198

 

 

912

Sold

 

 

(8,416)

 

 

(6,291)

Revisions to cost estimates

 

 

 —

 

 

(2,399)

Settlements

 

 

(60)

 

 

(134)

Accretion expense

 

 

773

 

 

1,127

Asset retirement obligation, ending balance

 

$

6,074

 

$

13,579