Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2021

Asset Retirement Obligation Disclosure [Abstract]

Reconciliation of Beginning and Ending Aggregate Carrying Amounts of Asset Retirement Obligations

The following table presents the balance and activity of the Company’s asset retirement obligations (in thousands):

	Year Ended December 31,
	2021		2020		2019
Beginning balance	$	57,168	$	75,016	$	60,064
Liability incurred upon acquiring and drilling wells	18		309		2,771
Revisions in estimated cash flows (1)	6,800		(17,192)		12,208
Liability settled or disposed in current period (2)	(8,668)		(6,866)		(5,379)
Accretion (3)	4,050		5,901		5,352
Ending balance	59,368		57,168		75,016
Less: current portion	17,606		16,467		22,119
Asset retirement obligations, net of current	$	41,762	$	40,701	$	52,897

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(1)    Revisions for the years ended December 31, 2021, 2020 and 2019 relate primarily to changes in estimated well lives due to changes in oil and natural gas prices and changes in plugging cost estimates.

(2) $6.1 million is related to the sale of NPB in February 2021.

(3)    Included on the Depreciation and depletion - oil and natural gas line item on the Consolidated Statement of Operations.