Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2018

Property, Plant and Equipment [Abstract]

Summary of Property and Equipment

	Successor			Predecessor
(in thousands)	December 31, 2018			December 31, 2017
Oil and gas properties
Unproved properties	$	816,282		$	84,590
Accumulated impairment of unproved properties	(742,065		)	—
Unproved properties, net	74,217			84,590
Proved oil and gas properties	2,110,346			1,061,105
Accumulated depreciation, depletion, amortization and impairment	(1,421,226		)	(251,065		)
Proved oil and gas properties, net	689,120			810,040
Total oil and gas properties, net	763,337			894,630
Other property and equipment
Land	5,059			2,912
Fresh water wells	27,366			—
Produced water disposal system	3,608			30,990
Office furniture, equipment and vehicles	2,840			20,008
Accumulated depreciation	(726		)	(21,770		)
Other property and equipment, net	38,147			32,140
Total property and equipment, net	$	801,484		$	926,770

	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
Oil and gas properties depletion	$	130,439	$	11,021	$	83,537	$	49,481
Other property and equipment depreciation	2,375		609		5,240		4,004
Total depreciation and depletion expense	$	132,814	$	11,630	$	88,777	$	53,485