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Asset Retirement Obligation (Tables)
 3 Months Ended
Mar. 31, 2016
Asset Retirement Obligation [Abstract]  
Reconciliation of Asset Retirement Obligation

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

March 31, 

 

December 31, 

 

 

    

2016

    

2015

 

Asset retirement obligation, beginning balance

 

$
20,364

 

$
17,031

 

Liabilities added from acquisitions

 

 

 —

 

 
3,634

 

Sold

 

 

 —

 

 
(58)

 

Revisions to cost estimates

 

 
(26)

 

 
(1,156)

 

Settlements

 

 
(17)

 

 
(186)

 

Accretion expense

 

 
315

 

 
1,099

 

Asset retirement obligation, ending balance

 

$
20,636

 

$
20,364