Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	1 Months Ended	2 Months Ended	4 Months Ended	6 Months Ended	8 Months Ended
	Apr. 22, 2016	Jun. 30, 2016	Apr. 22, 2016	Jun. 30, 2017	Dec. 31, 2016
Predecessor [Member]
Cash Flows from Operating Activities:
Net Income (Loss)	$ 959,913		$ 851,611
Adjustments to reconcile net income to net cash provided by operating activities -
Depreciation, depletion, and amortization	3,194		20,439
Write-down of oil and gas properties	0		77,732
Accretion of asset retirement obligation	319		1,610
Stock-based compensation expenses			886
Loss (gain) on derivatives			0
Cash settlements on derivatives			0
Settlements of asset retirement obligations			(16)
Debt issuance cost write-down			0
Reorganization items (non-cash)			(977,696)
Other Noncash Income (Expense)			229
(Increase) decrease in accounts receivable and other current assets			(5,474)
Increase (decrease) in accounts payable and accrued liabilities			(10,479)
Increase (decrease) in accrued interest			(308)
Net Cash Provided by (Used in) Operating Activities			(41,466)
Cash Flows from Investing Activities:
Additions to property and equipment			(24,530)
Proceeds from the sale of property and equipment			(48,661)
Net Cash Provided by (Used in) Investing Activities			24,131
Cash Flows from Financing Activities:
Proceeds from bank borrowings			328,000
Payments of bank borrowings			(324,900)
Net proceeds from issuances of common stock			0
Purchase of treasury shares			(4)
Payments of debt issuance costs			(6,482)
Net Cash Provided by (Used in) Financing Activities			(3,386)
Net increase (decrease) in Cash and Cash Equivalents			(20,721)
Cash and Cash Equivalents at Beginning of Period		$ 8,739	29,460		$ 8,739
Cash and Cash Equivalents at End of Period	8,739		8,739
Supplemental Disclosures of Cash Flows Information:
Cash paid during period for interest, net of amounts capitalized			10,367
Cash paid for reorganization items			15,643
Changes in capital accounts payable and capital accruals			1,843
Successor [Member]
Cash Flows from Operating Activities:
Net Income (Loss)		(149,601)		$ 33,951	(156,288)
Adjustments to reconcile net income to net cash provided by operating activities -
Depreciation, depletion, and amortization		13,334		20,543
Write-down of oil and gas properties		133,496		0
Accretion of asset retirement obligation		832		1,140
Stock-based compensation expenses		191		3,136
Loss (gain) on derivatives		9,912		(16,068)
Cash settlements on derivatives		0		(2,586)
Settlements of asset retirement obligations		(486)		(1,894)
Debt issuance cost write-down		0		2,401
Reorganization items (non-cash)		0		0
Other Noncash Income (Expense)		438		482
(Increase) decrease in accounts receivable and other current assets		13,379		(1,486)
Increase (decrease) in accounts payable and accrued liabilities		(6,135)		4,437
Increase (decrease) in accrued interest		573		(90)
Net Cash Provided by (Used in) Operating Activities		15,933		43,966
Cash Flows from Investing Activities:
Additions to property and equipment		(20,876)		(85,655)
Proceeds from the sale of property and equipment		0		(460)
Net Cash Provided by (Used in) Investing Activities		(20,876)		(85,195)
Cash Flows from Financing Activities:
Proceeds from bank borrowings		21,000		300,000
Payments of bank borrowings		(20,000)		(287,000)
Net proceeds from issuances of common stock		0		39,244
Purchase of treasury shares		0		(618)
Payments of debt issuance costs		(502)		(4,073)
Net Cash Provided by (Used in) Financing Activities		498		47,553
Net increase (decrease) in Cash and Cash Equivalents		(4,445)		6,324
Cash and Cash Equivalents at Beginning of Period		8,739		303	8,739
Cash and Cash Equivalents at End of Period	$ 8,739	4,294	$ 8,739	6,627	$ 303
Supplemental Disclosures of Cash Flows Information:
Cash paid during period for interest, net of amounts capitalized		3,246		8,847
Cash paid for reorganization items		4,080		0
Changes in capital accounts payable and capital accruals		$ (8,353)		$ 5,356