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Asset Retirement Obligations
 6 Months Ended
Jun. 30, 2016
Asset Retirement Obligation Disclosure [Abstract]  
ASSET RETIREMENT OBLIGATIONS
ASSET RETIREMENT OBLIGATIONS
The following table summarizes the changes in the Company’s asset retirement obligations for the six months ended June 30, 2016 (in thousands).
 
 
Beginning asset retirement obligations
$
15,420

Liabilities incurred during period
1,044

Liabilities settled during period
(119
)
Revisions in estimated cash flows
1,662

Accretion expense
552

Ending asset retirement obligations
18,559

Less: current asset retirement obligations(1)
(61
)
Long-term asset retirement obligations
$
18,498

 _______________
(1)
Included in accrued liabilities in the Company’s interim unaudited condensed consolidated balance sheet at June 30, 2016.