Income Taxes - Reconciliation of Income Tax Expense With Income Tax Provision (Details) - USD ($) $ in Thousands	8 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income before income taxes		$ (24,318)	$ (33,142)	$ (116,620)
Less: income before income taxes attributable to predecessor		(5,118)	(30,805)	(116,620)
Less: income before income taxes attributable to temporary equity	$ (9,646)	(9,858)	0	0
Income before income taxes attributable to shareholders		9,342	2,337	0
Income tax at the federal statutory rate		1,962	491	0
State income taxes, net of federal benefit		717	(150)	1,008
Percentage depletion in excess of basis		0	(14)	0
Total income tax provision		$ 2,679	$ 327	$ 1,008