Impairment of Assets (Tables)

12 Months Ended

Dec. 31, 2018

Other Income and Expenses [Abstract]

Impairment of Assets

	Successor		Predecessor
(in thousands)	February 9, 2018 Through December 31, 2018		January 1, 2018 Through February 8, 2018		Year Ended December 31, 2017		Year Ended December 31, 2016
Impairment of unproved properties	$	742,065	$	—	$	—	$	16
Impairment of proved properties	1,291,647		—		1,188		366
Total impairment of assets	$	2,033,712	$	—	$	1,188	$	382