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Asset Retirement Obligations
 9 Months Ended
Sep. 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 nine months ended September 30, 2016 (in thousands).
 
 
Beginning asset retirement obligations
$
15,420

Liabilities incurred during period
1,903

Liabilities settled during period
(317
)
Revisions in estimated cash flows
1,647

Accretion expense
828

Ending asset retirement obligations
19,481

Less: current asset retirement obligations(1)
(29
)
Long-term asset retirement obligations
$
19,452

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