Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 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 years ended December 31, 2021 and 2020 (in thousands). 

	Year Ended December 31,
	2021		2020
Beginning asset retirement obligations	$	38,542	$	36,211
Liabilities incurred during period	2,294		2,548
Liabilities settled during period	(151)		(290)
Revisions in estimated cash flows	86		(1,875)
Divestitures during the period	(880)		—
Accretion expense	2,068		1,948
Ending asset retirement obligations	41,959		38,542
Less: current asset retirement obligations(1)	(270)		(623)
Long-term asset retirement obligations	$	41,689	$	37,919

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(1)Included in “Accrued liabilities” in the Company’s consolidated balance sheets at December 31, 2021 and 2020.