Asset Retirement Obligations (Tables)

9 Months Ended

Sep. 30, 2014

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, 2014 (in thousands).

Beginning asset retirement obligations	$	7,484
Liabilities incurred during period	1,906
Liabilities settled during period	(22		)
Revisions in estimated cash flows	1,552
Accretion expense	371
Ending asset retirement obligations	11,291
Less: current asset retirement obligations(1)	(540		)
Long-term asset retirement obligations	$	10,751