CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	4 Months Ended	8 Months Ended	12 Months Ended
	Dec. 31, 2016	Sep. 12, 2016	Dec. 31, 2017	Dec. 31, 2015
Cash and cash equivalents - beginning of period	$ 31,414		$ 6,761
Cash and cash equivalents - end of period	6,761	$ 31,414	11,017
Predecessor [Member]
Net increase (decrease) in cash and cash equivalents		19,459		$ 5,703
Cash and cash equivalents - beginning of period	31,414	11,955		6,252
Cash and cash equivalents - end of period		31,414		11,955
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)		1,054,602		(1,582,961)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Non-Cash Reorganization Items		(1,178,302)		0
Depreciation, depletion and amortization		33,582		334,479
Impairments		0		1,397,424
Accretion of firm transportation obligation		317		942
Derivative contracts:
Net losses (gains)		8,333		(71,247)
Cash settlements, net		48,008		138,169
Deferred income tax benefit		0		(4,712)
Loss (gain) on sales of assets, net		(1,261)		(41,335)
Non-cash exploration expense		6,038		5,759
Non-cash interest expense		22,189		4,749
Share-based compensation (equity-classified)		1,511		4,540
Other, net		(13)		13
Changes in operating assets and liabilities:
Accounts receivable, net		12,273		137,854
Accounts payable and accrued expenses		22,469		(152,553)
Other assets and liabilities		501		(1,818)
Net cash provided by operating activities		30,247		169,303
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures		(15,359)		(364,844)
Payments to Acquire Businesses, Net of Cash Acquired		0		0
Proceeds from sales of assets, net		224		85,189
Other Investing Activities, Net		1,186		0
Net cash used in investing activities		(13,949)		(279,655)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from credit facility borrowings		75,350		233,000
Repayment of credit facility borrowings		(119,121)		(98,000)
Proceeds from Second Lien Facility		0		0
Debt issuance costs paid		(3,011)		(744)
Proceeds Received from Rights Offering		49,943		0
Dividends paid on preferred stock		0		(18,201)
Other, net		0		0
Net cash provided by (used in) financing activities		3,161		116,055
Cash paid for:
Cash paid for interest (net of amounts capitalized)		4,331		86,226
Payments for Restructuring		30,990		0
Cash paid for income taxes (net of refunds)		(35)		(714)
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Common Stock Issued in Exchange for Liabilities		140,952		0
Changes in accrued liabilities related to capital expenditures		(11,301)		(55,660)
Derivatives Settled to Pay Down Revolver		51,979		$ 0
Successor [Member]
Net increase (decrease) in cash and cash equivalents	(24,653)		4,256
Cash and cash equivalents - beginning of period	31,414		6,761
Cash and cash equivalents - end of period	6,761	$ 31,414	11,017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	(5,296)		32,662
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Non-Cash Reorganization Items	0		0
Depreciation, depletion and amortization	11,652		48,649
Impairments	0		0
Accretion of firm transportation obligation	0		0
Derivative contracts:
Net losses (gains)	16,622		17,819
Cash settlements, net	384		(3,511)
Deferred income tax benefit	0		(4,943)
Loss (gain) on sales of assets, net	49		36
Non-cash exploration expense	0		0
Non-cash interest expense	226		2,122
Share-based compensation (equity-classified)	81		3,809
Other, net	21		61
Changes in operating assets and liabilities:
Accounts receivable, net	10,791		(43,318)
Accounts payable and accrued expenses	(3,887)		28,542
Other assets and liabilities	131		(218)
Net cash provided by operating activities	30,774		81,710
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures	(4,812)		(115,687)
Payments to Acquire Businesses, Net of Cash Acquired	0		(200,849)
Proceeds from sales of assets, net	0		869
Other Investing Activities, Net	(104)		0
Net cash used in investing activities	(4,916)		(315,667)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from credit facility borrowings	0		59,000
Repayment of credit facility borrowings	(50,350)		(7,000)
Proceeds from Second Lien Facility	0		196,000
Debt issuance costs paid	0		(9,787)
Proceeds Received from Rights Offering	0		55
Dividends paid on preferred stock	0		0
Other, net	(161)		(55)
Net cash provided by (used in) financing activities	(50,511)		238,213
Cash paid for:
Cash paid for interest (net of amounts capitalized)	598		4,102
Payments for Restructuring	525		954
Cash paid for income taxes (net of refunds)	(7)		0
Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract]
Common Stock Issued in Exchange for Liabilities	0		0
Changes in accrued liabilities related to capital expenditures	(997)		(19,910)
Derivatives Settled to Pay Down Revolver	$ 0		$ 0