Consolidated Statements of Cash Flows - USD ($) $ in Thousands	4 Months Ended	8 Months Ended	12 Months Ended
	Apr. 22, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Predecessor [Member]
Cash Flows from Operating Activities:
Net Income (Loss)	$ 851,611		$ (1,653,971)	$ (283,427)
Adjustments to reconcile net income to net cash provided by operation activities -
Write-down of oil and gas properties	77,732		1,562,086	445,396
Depreciation, depletion, and amortization	20,439		177,512	267,590
Accretion of asset retirement obligation	1,610		5,572	5,712
Deferred income taxes	0		(80,133)	(150,357)
Stock-based compensation expense	886		4,435	7,309
Gain (Loss) on Sale of Derivatives	0		(186)	(1,269)
Cash Received (Paid) On Settlements of Derivative Contracts	0		2,544	(1,053)
Reorganization items (non-cash)	(977,696)		6,565	0
Other Noncash Income			(3,189)	(6,588)
Other Noncash Expense	229
Change in assets and liabilities-
(Increase) decrease in accounts receivable and other assets	(5,474)		26,747	21,411
Increase (decrease) in accounts payable and accrued liabilities	(10,495)		(15,003)	1,505
Increase (decrease) in income taxes payable	0		(435)	314
Increase (decrease) in accrued interest	(308)		9,730	(172)
Net Cash Provided by Operating Activities	(41,466)		42,274	306,371
Cash Flows from Investing Activities:
Additions to property and equipment	(24,530)		(139,688)	(386,336)
Proceeds from the sale of property and equipment	48,661		1,164	145,035
Funds withdrawn from restricted cash account	0		0	25,994
Funds deposited into restricted cash account	0		0	(25,994)
Net Cash Used in Investing Activities	24,131		(138,524)	(241,301)
Cash Flows from Financing Activities:
Proceeds from bank borrowings	328,000		281,100	487,400
Payments of bank borrowings	(324,900)		(153,500)	(555,100)
Net proceeds from issuances of common stock	0		302	824
Purchase of treasury shares	(4)		(154)	(1,065)
Payments of debt issuance costs	(6,482)		(2,444)	0
Net Cash Provided by (Used in) Financing Activities	(3,386)		125,304	(67,941)
Net Increase (decrease) in Cash and Cash Equivalents	(20,721)		29,054	(2,871)
Cash and Cash Equivalents at Beginning of Period	29,460	$ 8,739	406	3,277
Cash and Cash Equivalents at End of Period	8,739		29,460	406
Supplemental Disclosures of Cash Flows Information:
Cash paid during period for interest, net of amounts capitalized	10,367		63,132	70,933
Cash paid during period for income taxes	0		450	150
Payments for Restructuring	15,643		0	0
Increase (decrease) in accrued payables for capital	1,843		$ (27,611)	$ (21,702)
Successor [Member]
Cash Flows from Operating Activities:
Net Income (Loss)		(156,288)
Adjustments to reconcile net income to net cash provided by operation activities -
Write-down of oil and gas properties		133,496
Depreciation, depletion, and amortization		36,436
Accretion of asset retirement obligation		2,878
Deferred income taxes		0
Stock-based compensation expense		3,618
Gain (Loss) on Sale of Derivatives		19,676
Cash Received (Paid) On Settlements of Derivative Contracts		(1,928)
Reorganization items (non-cash)		0
Other Noncash Expense		1,351
Change in assets and liabilities-
(Increase) decrease in accounts receivable and other assets		16,812
Increase (decrease) in accounts payable and accrued liabilities		(9,682)
Increase (decrease) in income taxes payable		0
Increase (decrease) in accrued interest		1,058
Net Cash Provided by Operating Activities		47,427
Cash Flows from Investing Activities:
Additions to property and equipment		(45,671)
Proceeds from the sale of property and equipment		45,985
Funds withdrawn from restricted cash account		0
Funds deposited into restricted cash account		0
Net Cash Used in Investing Activities		314
Cash Flows from Financing Activities:
Proceeds from bank borrowings		84,000
Payments of bank borrowings		(139,000)
Net proceeds from issuances of common stock		0
Purchase of treasury shares		(675)
Payments of debt issuance costs		(502)
Net Cash Provided by (Used in) Financing Activities		(56,177)
Net Increase (decrease) in Cash and Cash Equivalents		(8,436)
Cash and Cash Equivalents at Beginning of Period		8,739
Cash and Cash Equivalents at End of Period	$ 8,739	303
Supplemental Disclosures of Cash Flows Information:
Cash paid during period for interest, net of amounts capitalized		12,517
Cash paid during period for income taxes		0
Payments for Restructuring		12,929
Increase (decrease) in accrued payables for capital		$ (6,265)