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Asset Retirement Obligation (Tables)
 12 Months Ended
Dec. 31, 2015
Asset Retirement Obligation [Abstract]  
Reconciliation of Asset Retirement Obligation

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

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

December 31, 

 

December 31, 

 

 

    

2015

    

2014

 

Asset retirement obligation, beginning balance

 

$
17,031

 

$
9,513

 

Liabilities added from acquisitions

 

 
3,634

 

 
80

 

Liabilities added from drilling

 

 

 —

 

 
59

 

Sold

 

 
(58)

 

 

 —

 

Revisions to cost estimates

 

 
(1,156)

 

 
6,780

 

Settlements

 

 
(186)

 

 
(5)

 

Accretion expense

 

 
1,099

 

 
604

 

Asset retirement obligation, ending balance

 

$
20,364

 

$
17,031