Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	4 Months Ended	5 Months Ended	9 Months Ended
	Sep. 30, 2018	May 31, 2018	Sep. 30, 2019
Cash flows from operating activities:
Net loss	$ (10,298)		$ (116,211)
Adjustments to reconcile net loss to net cash flows provided by operating activities:
Accretion expense on obligations	3,134		6,373
Depreciation, depletion and amortization	10,590		10,712
Share-based compensation cost	1,144		2,184
Impairment of oil and natural gas properties	2,565		115,604
(Gain) loss on sales of oil and natural gas properties	(47)		(679)
Gain on equity securities	(4,830)		(4,593)
(Gain) loss on derivatives, net	30,655		(5,374)
Cash settlements of derivative contracts	(1,847)		17,483
Other	780		1,571
Changes in operating assets and liabilities:
Accounts receivable	(2,014)		21,637
Other current assets	314		1,909
Accounts payable and accrued liabilities	(4,183)		(4,061)
Other, net	(38)		(2,531)
Net cash flows provided by operating activities	25,925		44,024
Cash flows from investing activities:
Additions to oil and natural gas properties	(22,307)		(2,096)
Reimbursements related to oil and natural gas properties	1,091		2,124
Proceeds from sale of oil and natural gas properties	136,483		111,575
Proceeds from sale of equity securities			51,675
Other	16		38
Net cash flows provided by (used in) investing activities	115,283		163,316
Cash flows from financing activities:
Repayment of long–term debt borrowings	(164,000)		(115,000)
Purchase of treasury stock	(247)		(295)
Other			(10)
Net cash flows provided by (used in) financing activities	(164,247)		(115,305)
Increase (decrease) in cash, cash equivalents and restricted cash	(23,039)		92,035
Cash, cash equivalents and restricted cash - beginning of period	28,732		6,313
Cash, cash equivalents and restricted cash - end of period	5,693	$ 28,732	$ 98,348
Predecessor [Member]
Cash flows from operating activities:
Net loss		(610,525)
Adjustments to reconcile net loss to net cash flows provided by operating activities:
Accretion expense on obligations		3,176
Depreciation, depletion and amortization		46,196
Share-based compensation cost		3,784
Impairment of oil and natural gas properties		3
(Gain) loss on sales of oil and natural gas properties		5
(Gain) loss on derivatives, net		(444)
Cash settlements of derivative contracts		3,099
Reorganization items, net		573,304
Other		248
Changes in operating assets and liabilities:
Accounts receivable		(3,518)
Other current assets		1,853
Accounts payable and accrued liabilities		4,405
Other, net		69
Net cash flows provided by operating activities		21,655
Cash flows from investing activities:
Additions to oil and natural gas properties		(29,727)
Reimbursements related to oil and natural gas properties		652
Proceeds from sale of oil and natural gas properties		3
Other		26
Net cash flows provided by (used in) investing activities		(29,046)
Cash flows from financing activities:
Long-term debt borrowings		34,000
Loan costs incurred		(2,813)
Contributions from general partner		40
Net cash flows provided by (used in) financing activities		31,227
Increase (decrease) in cash, cash equivalents and restricted cash		23,836
Cash, cash equivalents and restricted cash - beginning of period	$ 28,732	4,896
Cash, cash equivalents and restricted cash - end of period		$ 28,732