Condensed Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		5 Months Ended	6 Months Ended	12 Months Ended
	Feb. 08, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2018	Jun. 30, 2019	Dec. 31, 2018
Net income (loss)		$ 11,599	$ (22,666)	$ (56,420)	$ (5,836)
Cash flows from operating activities:
Net loss		2,245	(6,600)	(19,930)	(6,162)
Adjustments to reconcile net loss to cash from operating activities:
Depreciation, depletion and amortization				49,613	75,908
Non-cash lease expense				0	1,675
Provision for uncollectible receivables				0	1,177
Impairment of assets				0	6,500
Amortization of deferred financing costs				152	368
Amortization of debt premium				(2,051)	(2,462)
Equity-based compensation expense		840	4,263	7,729	3,519
Non-cash exploration expense				7,288	388
(Gain) loss on derivatives		(12,412)	29,219	51,230	11,365
Cash settlements of derivatives				18,334	(909)
Premium paid on derivatives				0	(1,000)
Interest converted into debt				0	0
Interest added to notes receivable from affiliate				(417)	0
Deferred tax provision (benefit)				(7,665)	0
Loss on sale of fixed assets				63	114
Equity in earnings of unconsolidated subsidiaries		(643)	0	0	(742)
Impact on cash from changes in:
Accounts receivable				(9,143)	13,744
Other receivables				996	2,696
Related party receivables				(6,260)	179
Prepaid expenses and other assets				8,116	(4,426)
Advances from related party				(10,371)	(154)
Settlement of asset retirement obligations				(806)	(5,835)
Accounts payable, accrued liabilities and other liabilities				(78,542)	(12,123)
Operating lease obligations				0	(1,376)
Cash from operating activities				(64,822)	84,588
Cash flows from investing activities:
Capital expenditures				(340,631)	(247,942)
Acquisitions, net of cash acquired				(791,819)	0
Proceeds withdrawn from trust account				1,042,742	0
Investment in equity affiliate and other, net				(6,945)	0
Cash from investing activities				(96,653)	(247,942)
Cash flows from financing activities:
Proceeds from long-term debt borrowings				80,000	227,500
Repayments of long-term debt				(193,565)	0
Deferred financing costs paid				(3,670)	0
Capital distributions				0	0
Proceeds from issuance of Class A shares				400,000	0
Repayment of sponsor note				(2,000)	0
Repayment of deferred underwriting compensation				(36,225)	0
Redemption of Class A common shares				(33)	0
Cash from financing activities				244,507	227,500
Net increase in cash, cash equivalents and restricted cash				83,032	64,146
Cash, cash equivalents and restricted cash, beginning of period				388	27,855
Cash, cash equivalents and restricted cash, end of period	$ 388	$ 92,001	$ 83,420	83,420	$ 92,001	$ 27,855
Predecessor
Net income (loss)	(14,862)
Cash flows from operating activities:
Net loss	(14,862)
Adjustments to reconcile net loss to cash from operating activities:
Depreciation, depletion and amortization	12,554
Non-cash lease expense	0
Provision for uncollectible receivables	0
Impairment of assets	5,560
Amortization of deferred financing costs	171
Amortization of debt premium	0
Equity-based compensation expense	0
Non-cash exploration expense	4,575
(Gain) loss on derivatives	(6,663)
Cash settlements of derivatives	2,296
Premium paid on derivatives	0
Interest converted into debt	103
Interest added to notes receivable from affiliate	(85)
Deferred tax provision (benefit)	0
Loss on sale of fixed assets	1,923
Equity in earnings of unconsolidated subsidiaries	0
Impact on cash from changes in:
Accounts receivable	(21,184)
Other receivables	(662)
Related party receivables	(117)
Prepaid expenses and other assets	(591)
Advances from related party	24,116
Settlement of asset retirement obligations	(63)
Accounts payable, accrued liabilities and other liabilities	23,857
Operating lease obligations	0
Cash from operating activities	26,336
Cash flows from investing activities:
Capital expenditures	(36,695)
Acquisitions, net of cash acquired	(1,218)
Proceeds withdrawn from trust account	0
Investment in equity affiliate and other, net	0
Cash from investing activities	(37,913)
Cash flows from financing activities:
Proceeds from long-term debt borrowings	60,000
Repayments of long-term debt	(43,000)
Deferred financing costs paid	0
Capital distributions	(68)
Proceeds from issuance of Class A shares	0
Repayment of sponsor note	0
Repayment of deferred underwriting compensation	0
Redemption of Class A common shares	0
Cash from financing activities	16,932
Net increase in cash, cash equivalents and restricted cash						5,355
Cash, cash equivalents and restricted cash, beginning of period	4,990			$ 10,345		$ 4,990
Cash, cash equivalents and restricted cash, end of period	$ 10,345