ASSET RETIREMENT OBLIGATIONS (Tables)

6 Months Ended

Jun. 30, 2021

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, 2021 (in thousands).

Beginning asset retirement obligations	$	38,542
Liabilities incurred during period	635
Liabilities settled during period	(240)
Accretion expense	1,011
Ending asset retirement obligations	39,948
Less: current asset retirement obligations(1)	(211)
Long-term asset retirement obligations	$	39,737

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(1)Included in accrued liabilities in the Company’s interim unaudited condensed consolidated balance sheet at June 30, 2021.