Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	4 Months Ended	8 Months Ended	12 Months Ended
	Apr. 22, 2016	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2015
Successor [Member]
Revenues:
Oil and gas sales		$ 121,386	$ 195,910
Costs and Expenses:
General and administrative, net		22,538	30,000
Depreciation, depletion, and amortization		36,436	46,933
Accretion of asset retirement obligation		2,878	2,322
Lease operating cost		25,777	21,908
Transportation and gas processing		13,038	19,360
Severance and other taxes		6,713	8,205
Write-down of oil and gas properties		133,496	0
Total Operating Expenses		240,876	128,728
Operating Income (Loss)		(119,490)	67,182
Net gain (loss) on commodity derivatives		(19,677)	17,913
Interest expense, net		(15,310)	(15,070)
Reorganization items		(1,639)	0
Other income (expense), net		(172)	(8)
Income (Loss) Before Income Taxes		(156,288)	70,017
Provision (Benefit) for Income Taxes		0	(1,954)
Net Income (Loss)		$ (156,288)	$ 71,971
Per Share Amounts-
Earnings (Loss) Per Share, Basic		$ (15.61)	$ 6.28
Earnings (Loss) Per Share, Diluted		$ (15.61)	$ 6.25
Weighted Average Shares Outstanding - Basic		10,013	11,453
Weighted Average Shares Outstanding - Diluted		10,013	11,514
Predecessor [Member]
Revenues:
Oil and gas sales	$ 43,027			$ 246,270
Costs and Expenses:
General and administrative, net	9,245			42,611
Depreciation, depletion, and amortization	20,439			177,512
Accretion of asset retirement obligation	1,610			5,572
Lease operating cost	14,933			70,188
Transportation and gas processing	6,090			21,741
Severance and other taxes	3,917			17,090
Write-down of oil and gas properties	77,732			1,562,086
Total Operating Expenses	133,966			1,896,800
Operating Income (Loss)	(90,939)			(1,650,530)
Net gain (loss) on commodity derivatives	0			186
Interest expense, net	(13,347)			(75,870)
Reorganization items	956,142			(6,565)
Other income (expense), net	(245)			(1,735)
Income (Loss) Before Income Taxes	851,611			(1,734,514)
Provision (Benefit) for Income Taxes	0			(80,543)
Net Income (Loss)	$ 851,611			$ (1,653,971)
Per Share Amounts-
Earnings (Loss) Per Share, Basic	$ 19.06			$ (37.20)
Earnings (Loss) Per Share, Diluted	$ 18.64			$ (37.20)
Weighted Average Shares Outstanding - Basic	44,692			44,463
Weighted Average Shares Outstanding - Diluted	45,697			44,463