Asset Retirement Obligations (Tables)

3 Months Ended

Mar. 31, 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 three months ended March 31, 2014 (in thousands).

Beginning asset retirement obligations	$	7,484
Liabilities incurred during period	358
Liabilities settled during period	(22		)
Revisions in estimated cash flows	1,489
Accretion expense	117
Ending asset retirement obligations	9,426
Less: current asset retirement obligations(1)	(407		)
Long-term asset retirement obligations	$	9,019