Asset Retirement Obligations (Tables)

6 Months Ended

Jun. 30, 2017

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, 2017 (in thousands).

Beginning asset retirement obligations	$	20,640
Liabilities incurred during period	1,222
Liabilities settled during period	(176		)
Revisions in estimated cash flows	794
Accretion expense	614
Ending asset retirement obligations	23,094
Less: current asset retirement obligations(1)	(703		)
Long-term asset retirement obligations	$	22,391

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(1) Included in accrued liabilities in the Company’s interim unaudited condensed consolidated balance sheet at June 30, 2017.