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Asset Retirement Obligations (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2015 (in thousands).
 
 
Beginning asset retirement obligations
$
11,951

Liabilities incurred during period
2,357

Liabilities settled during period
(252
)
Revisions in estimated cash flows
(920
)
Accretion expense
244

Ending asset retirement obligations
13,380

Less: current asset retirement obligations(1)
(275
)
Long-term asset retirement obligations
$
13,105