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Income Taxes - Reconciliation of Differences between Federal Statutory and Effective Income Tax Rate (Details) - USD ($) $ in Thousands | 12 Months Ended
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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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