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Asset Retirement Obligations (Tables)
 9 Months Ended
Sep. 30, 2015
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of changes in Company's asset retirement obligations
The following table summarizes the changes in the Company’s asset retirement obligations for the nine months ended September 30, 2015 (in thousands).
 
 
Beginning asset retirement obligations
$
11,951

Liabilities incurred during period
2,670

Liabilities settled during period
(436
)
Revisions in estimated cash flows
(788
)
Accretion expense
427

Ending asset retirement obligations
13,824

Less: current asset retirement obligations(1)
(411
)
Long-term asset retirement obligations
$
13,413

 _______________
(1)
Included in accrued liabilities in the Company’s unaudited condensed consolidated balance sheet at September 30, 2015