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Income Taxes - Reconciliation of Differences between Federal Statutory and Effective Income Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
At statutory rate	$ (12,535)	$ 5,245	$ 8,281
State taxes, net of U.S. federal benefit	(757)	(99)	926
Foreign taxes	0	(223)	223
Federal tax deductions	357	(5)	(1,248)
Change in applicable tax rate	286	478	0
Provision to return permanent difference	340	(20)	7
R&D credits	67	(159)	(29)
Fuel tax credit	(125)	(90)	(176)
Foreign tax credit	0	153	(175)
Foreign branch loss	0	50	0
Gain on bargain purchase	0	(8,316)	0
Unrecognized tax benefits	2,163	0	0
NOL carryback/carryforward	1,186	(10,046)	0
Other	0	52	0
Total income tax (benefit) expense	$ (9,017)	$ (12,980)	$ 7,809

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