Consolidated statements of operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended	12 Months Ended
	Mar. 21, 2017		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues:
Commodity sales			$ 226,493
Sublease revenue			586
Total revenues			227,079
Costs and expenses:
Lease operating			72,132
Transportation and processing			9,503
Production taxes			11,750
Depreciation, depletion and amortization			92,599
Loss on impairment of oil and gas assets			42,146
Loss on impairment of other assets			179
General and administrative			39,617
Liability management			0
Cost reduction initiatives			691
Restructuring			3,531
Sublease expense			197
Total costs and expenses			272,345
Operating (loss) income			(45,266)
Non-operating (expense) income:
Interest expense			(14,147)
(Loss) gain on extinguishment of debt			(635)
Non-hedge derivative (losses) gains			(30,802)
Write-off of Senior Note issuance costs, discount and premium			0
(Loss) gain on sale of assets			(25,996)
Other income (expense), net			686
Net non-operating (expense) income			(70,894)
Reorganization items, net			(3,091)
(Loss) income before income taxes			(119,251)
Income tax (benefit) expense			(349)
Net (loss) income			$ (118,902)
Earnings per share:
Basic for Class A and Class B			$ (2.64)
Diluted for Class A and Class B			$ (2.64)
Weighted average shares used to compute earnings per share:
Basic for Class A and Class B			44,984,046
Diluted for Class A and Class B			44,984,046
Predecessor
Revenues:
Commodity sales	$ 66,531			$ 252,152	$ 324,315
Sublease revenue	0			0	0
Total revenues	66,531			252,152	324,315
Costs and expenses:
Lease operating	19,941			90,533	110,659
Transportation and processing	2,034			8,845	8,541
Production taxes	2,417			9,610	9,953
Depreciation, depletion and amortization	24,915			122,928	216,574
Loss on impairment of oil and gas assets	0			281,079	1,491,129
Loss on impairment of other assets	0			1,393	16,207
General and administrative	6,843			20,953	39,089
Liability management	0			9,396	0
Cost reduction initiatives	629			2,879	10,028
Restructuring	0			0	0
Total costs and expenses	56,779			547,616	1,902,180
Operating (loss) income	9,752	[1]		(295,464)	(1,577,865)
Non-operating (expense) income:
Interest expense	(5,862)			(64,242)	(112,400)
(Loss) gain on extinguishment of debt	0			0	31,590
Non-hedge derivative (losses) gains	48,006			(22,837)	145,288
Write-off of Senior Note issuance costs, discount and premium	0			(16,970)	0
(Loss) gain on sale of assets	206			(117)	1,584
Other income (expense), net	1,167			528	740
Net non-operating (expense) income	43,517			(103,638)	66,802
Reorganization items, net	988,727			(16,720)	0
(Loss) income before income taxes	1,041,996			(415,822)	(1,511,063)
Income tax (benefit) expense	37			(102)	(177,219)
Net (loss) income	$ 1,041,959	[2],[3]		$ (415,720)	$ (1,333,844)
Earnings per share:
Basic for Class A and Class B	$ 0			$ 0	$ 0
Diluted for Class A and Class B	$ 0			$ 0	$ 0
Weighted average shares used to compute earnings per share:
Basic for Class A and Class B	0			0	0
Diluted for Class A and Class B	0			0	0

[1] Includes loss on impairment of oil and natural gas properties of $42,146 for the fourth quarter.

[2] Includes a loss from the sale of our EOR assets of $25,163 for the fourth quarter. See “Note 6—Acquisitions and divestitures” for additional information.

[3] Includes reorganization items income (expense) related to the Company’s restructuring under Chapter 11 filings of $988,727, $(620), $(1,070), $(858), and $(543) for the Predecessor first quarter, Successor first, second, third, and fourth quarters, respectively. See “Note 4—Fresh start accounting” for additional information.