Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2020

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 years ended December 31, 2020 and 2019 (in thousands). 

	Year Ended December 31,
	2020		2019
Beginning asset retirement obligations	$	36,211	$	31,086
Liabilities incurred during period	2,548		3,811
Liabilities settled during period	(290)		(155)
Revisions in estimated cash flows	(1,875)		1,792
Divestitures during the period	—		(2,145)
Accretion expense	1,948		1,822
Ending asset retirement obligations	38,542		36,211
Less: current asset retirement obligations(1)	(623)		(619)
Long-term asset retirement obligations	$	37,919	$	35,592

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(1)Included in “Accrued liabilities” in the Company’s consolidated balance sheets at December 31, 2020 and 2019.