Asset Retirement Obligations (Tables)

3 Months Ended

Mar. 31, 2018

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, 2018 (in thousands).

Beginning asset retirement obligations	$	26,256
Liabilities incurred during period	747
Liabilities settled during period	(411		)
Accretion expense	364
Ending asset retirement obligations	26,956
Less: current asset retirement obligations(1)	(1,274		)
Long-term asset retirement obligations	$	25,682

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(1) Included in accrued liabilities in the Company’s interim unaudited condensed consolidated balance sheet at March 31, 2018.