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Asset Retirement Obligation (Tables)
 6 Months Ended
Jun. 30, 2016
Asset Retirement Obligation [Abstract]  
Reconciliation of Asset Retirement Obligation

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

June 30, 

 

December 31, 

 

 

    

2016

    

2015

 

Asset retirement obligation, beginning balance

 

$
20,364

 

$
17,031

 

Liabilities added from acquisitions

 

 

 —

 

 
3,634

 

Liabilities added from drilling

 

 

 —

 

 

 —

 

Sold

 

 

 —

 

 
(58)

 

Revisions to cost estimates

 

 
(1,393)

 

 
(1,156)

 

Settlements

 

 
(86)

 

 
(186)

 

Accretion expense

 

 
630

 

 
1,099

 

Asset retirement obligation, ending balance

 

$
19,515

 

$
20,364