Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	1 Months Ended	2 Months Ended	3 Months Ended
	Feb. 08, 2018	Mar. 31, 2018	Mar. 31, 2019
Revenue
Operating revenue		$ 57,890	$ 135,829
Gain on sale of assets		5,139	1,483
Gain (loss) on derivatives		(22,011)	(23,777)
Total revenue		41,018	113,535
Operating expenses
Lease operating		8,317	19,944
Transportation, processing and marketing		3,359	4,603
Midstream operating		587	6,151
Cost of sales for purchased gathered production		3,809	9,695
Production taxes		1,415	5,483
Workovers		1,245	313
Exploration		1,585	2,054
Depreciation, depletion and amortization		15,679	37,899
General and administrative		37,752	29,518
Total operating expenses		73,748	115,660
Operating income		(32,730)	(2,125)
Other income (expense)
Interest expense		(5,444)	(15,460)
Interest income		546	51
Equity in earnings of unconsolidated subsidiaries		0	99
Total other income (expense), net		(4,898)	(15,310)
Loss from continuing operations before income taxes		(37,628)	(17,435)
Income tax provision (benefit)		(3,874)	0
Loss from continuing operations		(33,754)	(17,435)
Loss from discontinued operations, net of tax		0	0
Net loss		(33,754)	(17,435)
Net loss attributable to noncontrolling interests			(9,028)
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest		$ (33,754)	(17,435)
Net loss attributable to Alta Mesa Resources, Inc. stockholders			$ (8,407)
Loss per share - basic and diluted (in USD per share)		$ (0.08)	$ (0.05)
Weighted average shares outstanding - basic and diluted (in shares)		169,371,730	180,265,954
Oil
Revenue
Operating revenue		$ 40,278	$ 86,363
Natural gas
Revenue
Operating revenue		5,210	18,450
Natural gas liquids
Revenue
Operating revenue		4,714	11,216
Sales of gathered production
Revenue
Operating revenue		3,873	9,560
Midstream revenue
Revenue
Operating revenue		3,260	7,155
Other
Revenue
Operating revenue		$ 555	$ 3,085
Predecessor
Revenue
Operating revenue	$ 40,136
Gain on sale of assets	840
Gain (loss) on derivatives	6,663
Total revenue	47,639
Operating expenses
Lease operating	4,408
Transportation, processing and marketing	3,725
Midstream operating	0
Cost of sales for purchased gathered production	0
Production taxes	953
Workovers	423
Exploration	7,003
Depreciation, depletion and amortization	11,670
General and administrative	21,234
Total operating expenses	49,416
Operating income	(1,777)
Other income (expense)
Interest expense	(5,511)
Interest income	172
Equity in earnings of unconsolidated subsidiaries	0
Total other income (expense), net	(5,339)
Loss from continuing operations before income taxes	(7,116)
Income tax provision (benefit)	0
Loss from continuing operations	(7,116)
Loss from discontinued operations, net of tax	(7,746)
Net loss	(14,862)
Net loss attributable to Alta Mesa Resources, Inc. stockholders	(14,862)
Predecessor | Oil
Revenue
Operating revenue	30,972
Predecessor | Natural gas
Revenue
Operating revenue	4,276
Predecessor | Natural gas liquids
Revenue
Operating revenue	4,000
Predecessor | Sales of gathered production
Revenue
Operating revenue	0
Predecessor | Midstream revenue
Revenue
Operating revenue	0
Predecessor | Other
Revenue
Operating revenue	$ 888