Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	1 Months Ended	11 Months Ended	12 Months Ended
	Feb. 08, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net loss		$ (2,076,374)
Adjustments to reconcile net loss to cash from operating activities:
Depreciation, depletion and amortization		133,554
Provision for uncollectible related party receivables		22,438
Impairments		2,033,712
Amortization of deferred financing costs		221
Amortization of debt (premium) discount		(4,512)
Equity-based compensation expense		20,000
Exploratory dry hole expense		1,954
Expired leases		24,101
(Gain) loss on derivatives		10,247
Cash settlements of derivatives		(38,961)
Premium paid on derivatives		0
Interest converted into debt		0
(Gain) loss on sale of property and equipment		12,454
(Gain) loss on sale of property and equipment		388
Gain on acquisitions of oil and gas properties		0
Impact on cash from changes in:
Accounts receivable		10,936
Other receivables		(4,205)
Receivables from affiliate and related party		(14,320)
Prepaid expenses and other non-current assets		10,881
Advances from related party		(37,684)
Settlement of asset retirement obligations		(1,610)
Accounts payable to related party		2,032
Accounts payable, accrued liabilities, and other liabilities		(11,772)
Cash from operating activities		93,480
Cash flows from investing activities:
Capital expenditures		(700,953)
Acquisitions, net of cash acquired		(31,959)
Proceeds from sale of assets		89,166
Notes receivable due from affiliate		0
Cash from investing activities		(643,746)
Cash flows from financing activities:
Proceeds from long-term debt borrowings		241,000
Repayments of long-term debt		(214,065)
Deferred financing costs paid		(1,373)
Capital distributions		(32,000)
Capital contributions		560,344
Cash from financing activities		553,906
Net Increase (Decrease) In Cash, Cash Equivalents and Restricted Cash		3,640
Cash, Cash Equivalents and Restricted Cash, Beginning of Period		10,345
Cash, Cash Equivalents and Restricted Cash, End of Period	$ 10,345	13,985
Predecessor
Cash flows from operating activities:
Net loss	(14,862)		$ (77,661)	$ (167,921)
Adjustments to reconcile net loss to cash from operating activities:
Depreciation, depletion and amortization	12,554		113,634	95,075
Provision for uncollectible related party receivables	0		0	0
Impairments	5,560		30,317	16,306
Amortization of deferred financing costs	171		2,732	3,905
Amortization of debt (premium) discount	0		0	468
Equity-based compensation expense	0		0	0
Exploratory dry hole expense	0		2,500	419
Expired leases	4,575		9,125	11,158
(Gain) loss on derivatives	(6,663)		(8,287)	40,460
Cash settlements of derivatives	(2,296)		4,117	88,689
Premium paid on derivatives	0		(520)	18,151
Interest converted into debt	103		1,209	1,209
(Gain) loss on sale of property and equipment	(85)		(867)	(774)
(Gain) loss on sale of property and equipment	1,923		22,179	(3,542)
Gain on acquisitions of oil and gas properties	0		(3,294)	0
Impact on cash from changes in:
Accounts receivable	(21,184)		(43,530)	(10,500)
Other receivables	(662)		6,519	10,465
Receivables from affiliate and related party	(117)		218	45
Prepaid expenses and other non-current assets	(591)		(6,203)	(819)
Advances from related party	24,116		(19,138)	42,528
Settlement of asset retirement obligations	(63)		(6,409)	(2,125)
Accounts payable to related party	0		(2,170)	0
Accounts payable, accrued liabilities, and other liabilities	23,857		34,857	(11,493)
Cash from operating activities	26,336		59,328	131,704
Cash flows from investing activities:
Capital expenditures	(36,695)		(313,961)	(214,061)
Acquisitions, net of cash acquired	(1,218)		(55,605)	(11,527)
Proceeds from sale of assets	0		25,205	1,290
Notes receivable due from affiliate	0		(1,515)	0
Cash from investing activities	(37,913)		(345,876)	(224,298)
Cash flows from financing activities:
Proceeds from long-term debt borrowings	60,000		373,065	722,557
Repayments of long-term debt	(43,000)		(296,622)	(921,034)
Deferred financing costs paid	0		(398)	(13,747)
Capital distributions	(68)		0
Capital contributions	0		207,875	303,462
Cash from financing activities	16,932		283,920	91,238
Net Increase (Decrease) In Cash, Cash Equivalents and Restricted Cash	5,355		(2,628)	(1,356)
Cash, Cash Equivalents and Restricted Cash, Beginning of Period	4,990	$ 10,345	7,618	8,974
Cash, Cash Equivalents and Restricted Cash, End of Period	$ 10,345		$ 4,990	$ 7,618