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Income Taxes (Components of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Taxes [Abstract]    
Deferred tax assets, Accrued postretirement and pension benefits $ 1,663 $ 1,541
Deferred tax liabilities, Intangible assets (17) (13)
Deferred tax assets, Accrued expenses 2,027 3,370
Deferred tax assets, Deferred state and local incentive revenue 1,132 1,780
Deferred tax assets, Inventory valuation 3,145 2,071
Deferred tax liabilities, Property, plant and equipment and railcars on operating leases (2,018) (6,295)
Deferred tax assets, Net operating loss and tax credit 48,738 34,078
Deferred tax assets, Stock-based compensation expense 1,127 1,152
Lease liability 8,086 17,326
Deferred tax assets, Other 1,135  
Right of use asset (5,543) (14,193)
Deferred tax Liabilities, Other   (1,028)
Deferred Tax Assets, Gross, Total 67,053 61,318
Deferred Tax Liabilities, Gross, Total (7,578) (21,529)
Deferred Tax Assets, Valuation Allowance (59,613) (39,792)
Deferred tax assets, net, total 7,440 21,526
Deferred tax liabilities, net, total (7,578) (21,529)
Increase (decrease) in valuation allowance $ 19,821 $ 15,342