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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, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
At statutory rate	$ 5,000	$ 6,551	$ 6,931
Non-deductible interest expense	0	0	1,948
State taxes, net of US federal benefit	209	377	339
Foreign taxes	72	0	0
Federal tax deductions	238	(73)	(679)
Change in applicable tax rate	144	(8,468)	0
Provision to return permanent difference	(129)	(767)	933
Refund claims	(120)	(201)	0
Fuel tax credit	(243)	(166)	0
Foreign tax credit	(49)	0	0
Other	0	(62)	(78)
Total income tax expense (benefit)	$ 5,122	$ (2,809)	$ 9,394

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