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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, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
At statutory rate	$ 8,281	$ 5,000	$ 6,551
Non-deductible interest expense	0	0	0
State taxes, net of U.S. federal benefit	926	209	377
Foreign taxes	223	72	0
Federal tax deductions	(1,248)	238	(73)
Change in applicable tax rate	0	144	(8,468)
Provision to return permanent difference	7	(129)	(767)
Refund claims	(29)	(120)	(201)
Fuel tax credit	(176)	(243)	(166)
Foreign tax credit	(175)	(49)	0
Other	0	0	(62)
Total income tax expense (benefit)	$ 7,809	$ 5,122	$ (2,809)

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