Asset retirement obligations (Tables)

3 Months Ended

Mar. 31, 2022

Asset Retirement Obligation Disclosure [Abstract]

Schedule of asset retirement obligation liability

The following table reconciles the Company's asset retirement obligation liability associated with tangible long-lived assets for the periods presented:

	Three months ended March 31,
(in thousands)	2022		2021
Liability at beginning of period	$	72,003	$	68,326
Liabilities added due to acquisitions, drilling, midstream service asset construction and other	181		397
Accretion expense(1)	1,019		1,143
Liabilities settled due to plugging and abandonment or removed due to sale	(555)		(57)
Liability at end of period	$	72,648	$	69,809

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(1)Accretion expense is included in "Other operating expenses" on the unaudited consolidated statements of operations.