Income Taxes - Narrative (Details) - USD ($) $ in Thousands		3 Months Ended
	Feb. 26, 2021	Dec. 31, 2021	Dec. 31, 2020
Tax Credit Carryforward [Line Items]
Provision for deferred income taxes	$ 13,600	$ 5,756	$ (515)
Operating loss carryforwards		13,400
Operating loss carryforwards, subject to expiration		4,600
Operating loss carryforwards, not subject to expiration		8,800
Riley Exploration
Tax Credit Carryforward [Line Items]
Operating loss carryforwards, not subject to expiration		$ 1,700