Asset Retirement Obligations (Tables)

3 Months Ended

Mar. 31, 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 three months ended March 31, 2015 (in thousands).

Beginning asset retirement obligations	$	11,951
Liabilities incurred during period	2,404
Liabilities settled during period	(221		)
Revisions in estimated cash flows	(703		)
Accretion expense	112
Ending asset retirement obligations	13,543
Less: current asset retirement obligations(1)	(268		)
Long-term asset retirement obligations	$	13,275