Impairment of Assets (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	11 Months Ended	12 Months Ended
	Feb. 08, 2018	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Impairment of unproved properties			$ 742,065
Impairment of proved properties			1,291,647
Total impairment of assets			$ 2,033,712
Predecessor
Segment Reporting Information [Line Items]
Impairment of unproved properties	$ 0			$ 0	$ 16
Impairment of proved properties	0			1,188	366
Total impairment of assets	$ 0			$ 1,188	$ 382
Proved And Unproved Oil and Gas Properties
Segment Reporting Information [Line Items]
Total impairment of assets		$ 2,000,000