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Income Taxes (Components of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Income Taxes [Abstract] |  |
Deferred tax assets, Accrued postretirement and pension benefits | $ 1,541 | $ 2,424
Deferred tax liabilities, Intangible assets | (13) | (1,653)
Deferred tax assets, Accrued expenses | 3,370 | 9,210
Deferred tax assets, Deferred state and local incentive revenue | 1,780 | 2,349
Deferred tax assets, Inventory valuation | 2,071 | 2,338
Deferred tax liabilities, Property, plant and equipment and railcars on operating leases | (6,295) | (20,975)
Deferred tax assets, Net operating loss and tax credit | 34,078 | 28,165
Deferred tax assets, Stock-based compensation expense | 1,152 | 1,168
Lease liability | 17,326 |
Deferred tax assets, Other |  | 1,320
Right of use asset | (14,193) |
Deferred tax Liabilities, Other | (1,028) | (251)
Deferred Tax Assets, Gross, Total | 61,318 | 46,974
Deferred Tax Liabilities, Gross, Total | (21,529) | (22,879)
Deferred Tax Assets, Valuation Allowance | (39,792) | (24,450)
Deferred tax assets, net, total | 21,526 | 22,524
Deferred tax liabilities, net, total | (21,529) | (22,879)
Increase (decrease) in valuation allowance | $ 15,342 | $ 18,187

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