Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets
Net operating loss carryforward	$ 5,196	$ 27,025
Oil and gas properties, and other property and equipment	17,828	0
Stock-based compensation	0	922
Intangibles	183	257
Derivative instruments	2,036	606
Interest expense limitation	11,753	19,243
Organizational expenses and other	553	3,306
Total deferred tax assets	37,549	51,359
Deferred tax liabilities
Oil and gas properties, and other property and equipment, principally due to intangible drilling assets	0	(43,414)
Net deferred tax assets	37,549	7,945
Valuation allowance for deferred tax assets	(37,549)	(8,876)
Net deferred tax liability, net of valuation allowance	$ 0	$ (931)