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Asset Retirement Obligation (Tables)
 12 Months Ended
Dec. 31, 2016
Asset Retirement Obligation  
Reconciliation of Asset Retirement Obligation

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

December 31, 

 

    

2016

    

2015

Asset retirement obligation, beginning balance

 

$
20,364

 

$
17,031

Liabilities added from acquisitions

 

 
912

 

 
3,634

Sold

 

 
(6,291)

 

 
(58)

Revisions to cost estimates

 

 
(2,399)

 

 
(1,156)

Settlements

 

 
(134)

 

 
(186)

Accretion expense

 

 
1,127

 

 
1,099

Asset retirement obligation, ending balance

 

$
13,579

 

$
20,364