CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended	8 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 12, 2016	Sep. 30, 2017	Sep. 12, 2016	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities
Net income (loss)					$ 43,463
Derivative contracts:
Share-based compensation (equity-classified)					2,700
Cash flows from financing activities
Proceeds received from rights offering, net					100
Cash and cash equivalents – beginning of period					6,761
Cash and cash equivalents – end of period			$ 7,487		7,487
Successor [Member]
Cash flows from operating activities
Net income (loss)	$ (3,441)		(5,947)		43,463
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Non-cash reorganization items	0				0
Depreciation, depletion and amortization	2,029		10,659		31,545
Accretion of firm transportation obligation	0				0
Derivative contracts:
Net (gains) losses	4,369				(15,802)
Cash settlements, net	0				(1,670)
Loss (gain) on sales of assets, net	0				60
Non-cash exploration expense	0				0
Non-cash interest expense	38				1,362
Share-based compensation (equity-classified)	0				2,707
Other, net	0				59
Changes in operating assets and liabilities, net	585				(11,430)
Net cash provided by operating activities	3,580				50,294
Cash flows from investing activities
Acquisition, net	0				(200,162)
Capital expenditures	0				(67,844)
Proceeds from sales of assets, net	0				0
Other, net	0				0
Net cash used in investing activities	0				(268,006)
Cash flows from financing activities
Proceeds from credit facility borrowings	0				39,000
Repayment of credit facility borrowings	(21,000)				(7,000)
Proceeds from second lien facility, net	0				196,000
Debt issuance costs paid	0				(9,562)
Proceeds received from rights offering, net	0				55
Other, net	0				(55)
Net cash provided by (used in) financing activities	(21,000)				218,438
Net increase (decrease) in cash and cash equivalents	(17,420)				726
Cash and cash equivalents – beginning of period					6,761
Cash and cash equivalents – end of period	13,994		$ 7,487		7,487	$ 13,994
Cash paid for:
Interest, net of amounts capitalized	0				1,596
Income taxes, net of (refunds)	0				0
Reorganization items, net	0				1,098
Non-cash investing and financing activities:
Common stock issued in exchange for liabilities	0				0
Changes in accrued liabilities related to capital expenditures	0				8,140
Derivatives settled to reduce outstanding debt	0				$ 0
Predecessor [Member]
Cash flows from operating activities
Net income (loss)		$ 1,155,341		$ 1,054,602
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Non-cash reorganization items				(1,178,302)
Depreciation, depletion and amortization		8,024		33,582
Accretion of firm transportation obligation				317		300
Derivative contracts:
Net (gains) losses				8,333
Cash settlements, net				48,008
Loss (gain) on sales of assets, net				(1,261)
Non-cash exploration expense				6,038
Non-cash interest expense				22,188
Share-based compensation (equity-classified)				1,511
Other, net				(13)
Changes in operating assets and liabilities, net				35,244
Net cash provided by operating activities				30,247
Cash flows from investing activities
Acquisition, net				0
Capital expenditures				(15,359)
Proceeds from sales of assets, net				224
Other, net				1,186
Net cash used in investing activities				(13,949)
Cash flows from financing activities
Proceeds from credit facility borrowings				75,350
Repayment of credit facility borrowings				(119,121)
Proceeds from second lien facility, net				0
Debt issuance costs paid				(3,011)
Proceeds received from rights offering, net				49,943
Other, net				0
Net cash provided by (used in) financing activities				3,161
Net increase (decrease) in cash and cash equivalents				19,459
Cash and cash equivalents – beginning of period	$ 31,414			11,955		11,955
Cash and cash equivalents – end of period		$ 31,414		31,414
Cash paid for:
Interest, net of amounts capitalized				4,331
Income taxes, net of (refunds)				(35)
Reorganization items, net				30,990
Non-cash investing and financing activities:
Common stock issued in exchange for liabilities				140,952
Changes in accrued liabilities related to capital expenditures				(11,301)
Derivatives settled to reduce outstanding debt				$ 51,979		$ 52,000