Asset Retirement Obligations (Tables)

12 Months Ended

Dec. 31, 2018

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):


	Successor								Predecessor
	Year Ended December 31, 2018		Year Ended December 31, 2017		Period from October 2, 2016 through December 31, 2016		Period from January 1, 2016 through October 1, 2016
Beginning balance	$	77,544	$	106,481	$	92,413	$	103,578
Liability incurred upon acquiring and drilling wells	7,079		1,336		121		505
Revisions in estimated cash flows(1)	870		(28,565)		12,397		—
Liability settled or disposed in current period(2)	(31,967)		(11,308)		(540)		(36,979)
Accretion	6,538		9,600		2,090		4,365
Impact of fresh start accounting	—		—		—		20,944
Ending balance	60,064		77,544		106,481		92,413
Less: current portion	25,393		41,017		66,154		65,678
Asset retirement obligations, net of current	$	34,671	$	36,527	$	40,327	$	26,735

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1.Revisions for the years ended December 31, 2018 and 2017, and the Successor 2016 Period relate primarily to changes in estimated well lives due to changes in oil and natural gas prices and changes in plugging cost estimates.

2.Liability settled or disposed for the year ended December 31, 2018 includes $26.9 million associated with the Permian Properties sold in November 2018. Liability settled or disposed for the Predecessor 2016 Period includes $34.1 million associated with the WTO Properties sold in January 2016.