Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	4 Months Ended	5 Months Ended	9 Months Ended
	Apr. 22, 2016	Sep. 30, 2016	Sep. 30, 2015
Predecessor [Member]
Cash Flows from Operating Activities:
Net Income (Loss)	$ 851,611		$ (1,124,532)
Adjustments to reconcile net income to net cash provided by operating activities -
Depreciation, depletion, and amortization	20,439		138,392
Write-down of oil and gas properties	77,732		1,084,595
Accretion of asset retirement obligation	1,610		4,156
Deferred income taxes	0		(80,133)
Stock-based compensation expenses	886		3,288
Loss on derivatives	0		(271)
Cash settlements on derivatives	0		2,299
Reorganization items (non-cash)	(977,696)		0
Other Noncash Income (Expense)	229		1,599
(Increase) Decrease in accounts receivable and other current assets	(5,474)		11,841
Increase (decrease) in accounts payable and accrued liabilities	(10,495)		(4,768)
Increase (decrease) in income taxes payable	0		(450)
Increase (decrease) in accrued interest	(308)		(7,606)
Net Cash Provided by Operating Activities	(41,466)		28,410
Cash Flows from Investing Activities:
Additions to property and equipment	(24,530)		(126,752)
Proceeds from the sale of property and equipment	(48,661)		(977)
Net Cash Used in Investing Activities	24,131		(125,775)
Cash Flows from Financing Activities:
Net proceeds from New Credit Facility	328,000		258,200
Payments of bank borrowings	(324,900)		(153,500)
Net proceeds from issuances of common stock	0		302
Purchase of treasury shares	(4)		(150)
Payments of debt issuance costs	(6,482)		(571)
Net Cash Used in Financing Activities	(3,386)		104,281
Net Increase (Decrease) in Cash and Cash Equivalents	(20,721)		6,916
Cash and Cash Equivalents at Beginning of Period	29,460	$ 8,739	406
Cash and Cash Equivalents at End of Period	8,739		7,322
Supplemental Disclosures of Cash Flows Information:
Cash paid during period for interest, net of amounts capitalized	10,367		62,012
Cash paid during period for income taxes	0		450
Cash paid for reorganization items	15,643		0
Increase (decrease) in accrued payables for capital expenditures	$ 1,843		$ (36,615)
Successor [Member]
Cash Flows from Operating Activities:
Net Income (Loss)		(149,207)
Adjustments to reconcile net income to net cash provided by operating activities -
Depreciation, depletion, and amortization		26,621
Write-down of oil and gas properties		133,496
Accretion of asset retirement obligation		1,931
Deferred income taxes		0
Stock-based compensation expenses		3,132
Loss on derivatives		7,308
Cash settlements on derivatives		(1,100)
Reorganization items (non-cash)		0
Other Noncash Income (Expense)		1,721
(Increase) Decrease in accounts receivable and other current assets		14,669
Increase (decrease) in accounts payable and accrued liabilities		(10,202)
Increase (decrease) in income taxes payable		0
Increase (decrease) in accrued interest		1,041
Net Cash Provided by Operating Activities		29,410
Cash Flows from Investing Activities:
Additions to property and equipment		(36,794)
Proceeds from the sale of property and equipment		(594)
Net Cash Used in Investing Activities		(36,200)
Cash Flows from Financing Activities:
Net proceeds from New Credit Facility		49,000
Payments of bank borrowings		(48,000)
Net proceeds from issuances of common stock		0
Purchase of treasury shares		0
Payments of debt issuance costs		(502)
Net Cash Used in Financing Activities		498
Net Increase (Decrease) in Cash and Cash Equivalents		(6,292)
Cash and Cash Equivalents at End of Period		2,447
Supplemental Disclosures of Cash Flows Information:
Cash paid during period for interest, net of amounts capitalized		8,021
Cash paid during period for income taxes		0
Cash paid for reorganization items		12,017
Increase (decrease) in accrued payables for capital expenditures		$ (17,554)