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Income Taxes (Components of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Income Taxes [Abstract] |  |
Deferred tax assets, Accrued postretirement and pension benefits | $ 149 | $ 1,663
Deferred tax liabilities, Intangible assets | (22) | (17)
Deferred tax assets, Accrued expenses | 1,367 | 2,027
Deferred tax assets, Deferred state and local incentive revenue | 537 | 1,132
Deferred tax assets, Inventory valuation | 496 | 3,145
Deferred tax assets, Property, plant and equipment and railcars on operating leases | 103 |
Deferred tax liabilities, Property, plant and equipment and railcars on operating leases |  | (2,018)
Deferred tax assets, Net operating loss and tax credit | 62,536 | 48,738
Deferred tax assets, Stock-based compensation expense | 1,539 | 1,127
Deferred tax assets, Other | 99 | 1,135
Right of use asset | (4,780) | (5,543)
Lease liability | 5,175 | 8,086
Deferred Tax Assets, Gross, Total | 72,001 | 67,053
Deferred Tax Liabilities, Gross, Total | (4,802) | (7,578)
Deferred Tax Assets, Valuation Allowance | (67,204) | (59,613)
Deferred tax assets, net, total | 4,797 | 7,440
Deferred tax liabilities, net, total | (4,802) | (7,578)
Increase (decrease) in valuation allowance | $ 7,591 | $ 19,821

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