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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, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
At statutory rate	$ 5,245	$ 8,281	$ 5,378
State taxes, net of U.S. federal benefit	(99)	926	209
Foreign taxes	(223)	223	72
Federal tax deductions	(5)	(1,248)	238
Change in applicable tax rate	478	0	144
Provision to return permanent difference	(20)	7	(129)
Refund claims	(159)	(29)	(120)
Fuel tax credit	(90)	(176)	(243)
Foreign tax credit	153	(175)	(49)
Foreign branch loss	50	0	0
Gain on bargain purchase	(8,316)	0	0
NOL carryback/carryforward	(10,046)	0	0
Other	52	0	9
Total income tax (benefit) expense	$ (12,980)	$ 7,809	$ 5,509

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