Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		4 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Apr. 22, 2016
Predecessor [Member]
Cash Flows from Operating Activities:
Net Income (Loss)		$ (108,303)	$ 851,611
Adjustments to reconcile net income to net cash provided by operating activities -
Depreciation, depletion, and amortization		17,245
Write-down of oil and gas properties		77,732
Accretion of asset retirement obligation		1,291
Stock-based compensation expenses		770
Loss (gain) on derivatives		0
Cash settlements on derivatives		0
Settlements of asset retirement obligations		(278)
Debt issuance cost write-down		0
Reorganization items (non-cash)		5,422
Other Noncash Income (Expense)		2,551
(Increase) decrease in accounts receivable and other current assets		3,167
Increase (decrease) in accounts payable and accrued liabilities		5,185
Increase (decrease) in accrued interest		(15)
Net Cash Provided by (Used in) Operating Activities		4,767
Cash Flows from Investing Activities:
Additions to property and equipment		(36,317)
Proceeds from the sale of property and equipment		(4,876)
Net Cash Provided by (Used in) Investing Activities		(31,441)
Cash Flows from Financing Activities:
Proceeds from bank borrowings		15,000
Payments of bank borrowings		0
Net proceeds from issuances of common stock		0
Purchase of treasury shares		(4)
Net Cash Provided by (Used in) Financing Activities		14,996
Net increase (decrease) in Cash and Cash Equivalents		(11,678)
Cash and Cash Equivalents at Beginning of Period		29,460	$ 29,460
Cash and Cash Equivalents at End of Period		17,782
Supplemental Disclosures of Cash Flows Information:
Cash paid during period for interest, net of amounts capitalized		4,793
Cash paid for reorganization items		5,007
Changes in capital accounts payable and capital accruals		$ (8,349)
Successor [Member]
Cash Flows from Operating Activities:
Net Income (Loss)	$ 17,710
Adjustments to reconcile net income to net cash provided by operating activities -
Depreciation, depletion, and amortization	9,715
Write-down of oil and gas properties	0
Accretion of asset retirement obligation	564
Stock-based compensation expenses	1,503
Loss (gain) on derivatives	(10,937)
Cash settlements on derivatives	(811)
Settlements of asset retirement obligations	(411)
Debt issuance cost write-down	450
Reorganization items (non-cash)	0
Other Noncash Income (Expense)	(315)
(Increase) decrease in accounts receivable and other current assets	(1,942)
Increase (decrease) in accounts payable and accrued liabilities	(3,436)
Increase (decrease) in accrued interest	(354)
Net Cash Provided by (Used in) Operating Activities	11,736
Cash Flows from Investing Activities:
Additions to property and equipment	(25,417)
Proceeds from the sale of property and equipment	(432)
Net Cash Provided by (Used in) Investing Activities	(24,985)
Cash Flows from Financing Activities:
Proceeds from bank borrowings	43,000
Payments of bank borrowings	(69,000)
Net proceeds from issuances of common stock	39,381
Purchase of treasury shares	(267)
Net Cash Provided by (Used in) Financing Activities	13,114
Net increase (decrease) in Cash and Cash Equivalents	(135)
Cash and Cash Equivalents at Beginning of Period	303
Cash and Cash Equivalents at End of Period	168
Supplemental Disclosures of Cash Flows Information:
Cash paid during period for interest, net of amounts capitalized	2,959
Cash paid for reorganization items	0
Changes in capital accounts payable and capital accruals	$ 7,365