STATEMENTS OF CONSOLIDATED CASH FLOWS - USD ($) $ in Thousands	4 Months Ended	8 Months Ended	12 Months Ended
	May 04, 2017	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net income (loss)		$ 1,286	$ (35,197)	$ 54,609
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization		35,979	55,843	52,334
Impairment expense		0	2,246	0
(Gain) loss on derivative instruments		31,609	6,476	(8,155)
Cash settlements (paid) received on expired derivative instruments		30,446	4,344	10,087
Cash settlements (paid) on terminated derivatives		0	0	0
Bad debt expense		0	301	106
Deferred income tax expense (benefit)		(2,206)	0	0
Amortization and write-off of deferred financing costs		2,093	1,174	2,518
(Gain) loss on extinguishment of debt		0	0	3,034
Accretion of asset retirement obligations		4,384	5,559	5,711
(Gain) loss on sale of properties		0	0	3,614
Share-based compensation (see Note 14)		2,516	4,530	4,374
Settlement of asset retirement obligations		(633)	(259)	(767)
Write-off of other property, plant & equipment		0	1,325	0
Reorganization items, net		0	0	0
Other		0	(8)	0
Changes in operating assets and liabilities:
Accounts receivable		(2,830)	10,701	5,783
Prepaid expenses and other assets		5,578	713	623
Payables and accrued liabilities		(13,590)	(13,592)	7,925
Other		10	3,127	(15)
Net cash provided by operating activities		94,642	47,283	141,781
Cash flows from investing activities:
Cash acquired from the Merger		0	19,250	0
Additions to oil and gas properties		(52,735)	(72,709)	(55,425)
Additions to other property and equipment		(127)	(1,081)	(492)
Additions to restricted investments		(495)	(155)	(500)
Withdrawals of restricted investments		0	90,000	62,467
Proceeds from the sale of oil and natural gas properties, net of cash and cash equivalents sold		0	0	17,113
Other		0	10	503
Net cash provided by (used in) investing activities		(53,357)	35,315	23,666
Cash flows from financing activities:
Advances on revolving credit facilities		9,000	125,000	315,000
Repayments of revolving credit facilities		(63,000)	(134,000)	(397,000)
Deferred financing costs		(642)	(882)	(3,451)
Dividends to stockholders		0	(15,889)	0
Common stock repurchased and retired under the share repurchase program		0	(26,203)	0
Treasury stock acquired and retired		0	(3,340)	0
Retirement of common stock under tender offer		0	0	(35,000)
Costs incurred in conjunction with tender offer		0	(107)	(521)
Payment to holders of the Notes		(8,193)	0	0
Payment to Predecessor common unitholders		(1,250)	0	0
Contribution from management		1,500	0	0
Restricted units returned to plan		0	(406)	(847)
Other		(9)	84	9
Net cash provided by (used in) financing activities		(62,594)	(132,302)	(121,810)
Net change in cash, cash equivalents and restricted cash		(21,309)	(49,704)	43,637
Cash, cash equivalents and restricted cash, beginning of period		27,701	50,029	6,392
Cash, cash equivalents and restricted cash, end of period	$ 27,701	6,392	325	50,029
Predecessor [Member]
Cash flows from operating activities:
Net income (loss)	(90,955)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation, depletion and amortization	37,717
Impairment expense	0
(Gain) loss on derivative instruments	(23,076)
Cash settlements (paid) received on expired derivative instruments	15,895
Cash settlements (paid) on terminated derivatives	94,146
Bad debt expense	0
Deferred income tax expense (benefit)	(74)
Amortization and write-off of deferred financing costs	0
(Gain) loss on extinguishment of debt	0
Accretion of asset retirement obligations	3,407
(Gain) loss on sale of properties	0
Share-based compensation (see Note 14)	3,667
Settlement of asset retirement obligations	(164)
Write-off of other property, plant & equipment	0
Reorganization items, net	68,356
Other	56
Changes in operating assets and liabilities:
Accounts receivable	1,024
Prepaid expenses and other assets	735
Payables and accrued liabilities	15,030
Other	(266)
Net cash provided by operating activities	125,498
Cash flows from investing activities:
Cash acquired from the Merger	0
Additions to oil and gas properties	(6,211)
Additions to other property and equipment	(76)
Additions to restricted investments	(209)
Withdrawals of restricted investments	0
Proceeds from the sale of oil and natural gas properties, net of cash and cash equivalents sold	0
Other	0
Net cash provided by (used in) investing activities	(6,496)
Cash flows from financing activities:
Advances on revolving credit facilities	16,600
Repayments of revolving credit facilities	(98,252)
Deferred financing costs	(8,575)
Dividends to stockholders	0
Common stock repurchased and retired under the share repurchase program	0
Treasury stock acquired and retired	0
Retirement of common stock under tender offer	0
Costs incurred in conjunction with tender offer	0
Payment to holders of the Notes	(16,446)
Payment to Predecessor common unitholders	0
Contribution from management	0
Restricted units returned to plan	(10)
Other	9
Net cash provided by (used in) financing activities	(106,674)
Net change in cash, cash equivalents and restricted cash	12,328
Cash, cash equivalents and restricted cash, beginning of period	15,373	27,701
Cash, cash equivalents and restricted cash, end of period	27,701
Midstates [Member]
Cash flows from financing activities:
Repayments of revolving credit facilities		$ 0	$ (76,559)	$ 0
Midstates [Member] | Predecessor [Member]
Cash flows from financing activities:
Repayments of revolving credit facilities	$ 0