STATEMENT OF CONSOLIDATED CHANGES IN EQUITY AND NONCONTROLLING INTEREST (Unaudited) - USD ($) $ in Thousands		Total	Additional Paid-in Capital	Retained Earnings (Accumulated Deficit)	Class A Common Stock	Class A Common Stock Common Stock		Class C Common Stock	Class C Common Stock Common Stock
Beginning balance, shares (in shares) at Dec. 31, 2017					37,732,112	3,965,000	[1]	0	135,540,000	[1]
Beginning balance at Dec. 31, 2017		$ 556,050	$ 574,611	$ (18,575)		$ 0	[1]		$ 14	[1]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares (in shares)	[1]					1,116,000			38,153,000
Issuance of shares		127,771	127,767						$ 4	[1]
Net (loss) income		(12,607)		(12,607)
Ending balance, shares (in shares) at Mar. 31, 2018	[1]					5,081,000			173,693,000
Ending balance at Mar. 31, 2018		671,214	702,378	(31,182)		$ 0	[1]		$ 18	[1]
Beginning balance at Dec. 31, 2017		0
Ending balance at Mar. 31, 2018		0
Beginning balance, shares (in shares) at Dec. 31, 2017					37,732,112	3,965,000	[1]	0	135,540,000	[1]
Beginning balance at Dec. 31, 2017		556,050	574,611	(18,575)		$ 0	[1]		$ 14	[1]
Ending balance, shares (in shares) at Aug. 07, 2018					65,496,277			0
Beginning balance at Dec. 31, 2017		0
Beginning balance, shares (in shares) at Nov. 08, 2018					67,616,277			0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares (in shares)					7,313,028			250,000,000
Ending balance, shares (in shares) at Nov. 09, 2018					74,929,305			250,000,000
Beginning balance, shares (in shares) at Dec. 31, 2018					74,929,305	74,929,000	[1]	250,000,000	250,000,000	[1]
Beginning balance at Dec. 31, 2018		(213,714)		(213,746)		$ 7	[1]		$ 25	[1]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income		1,100		1,100
Change in redemption value of noncontrolling interest		440,628	440,628
Ending balance, shares (in shares) at Mar. 31, 2019					74,929,305	74,929,000	[1]	250,000,000	250,000,000	[1]
Ending balance at Mar. 31, 2019		228,014	440,628	$ (212,646)		$ 7	[1]		$ 25	[1]
Beginning balance at Dec. 31, 2018		1,940,500
Increase (Decrease) in Temporary Equity [Roll Forward]
Net income		4,628
Change in redemption value of noncontrolling interest		(440,628)	$ (440,628)
Ending balance at Mar. 31, 2019		$ 1,504,500

[1] For periods prior to the Business Combination, the number of shares has been retroactively restated to reflect the number of shares received by Apache. For further detail of the Business Combination and associated financial statement presentation, please refer to Note 1 — Summary of Significant Accounting Policies and Note 2 — Recapitalization Transaction.