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Income Taxes (Components of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Income Taxes [Abstract]    
Deferred tax assets, Accrued postretirement and pension benefits $ 2,424 $ 2,545
Deferred tax liabilities, Intangible assets (1,653) (1,669)
Deferred tax assets, Accrued expenses 9,210 4,104
Deferred tax assets, Deferred state and local incentive revenue 2,349 2,933
Deferred tax assets, Inventory valuation 2,338 1,869
Deferred tax liabilities, Property, plant and equipment and railcars on operating leases (20,975) (8,957)
Deferred tax assets, Net operating loss and tax credit 28,165 13,371
Deferred tax assets, Stock-based compensation expense 1,168 807
Deferred tax assets, Other 1,320 1,085
Deferred tax Liabilities, Other (251) (379)
Deferred Tax Assets, Gross, Total 46,974 26,714
Deferred Tax Liabilities, Gross, Total (22,879) (11,005)
Deferred Tax Assets, Valuation Allowance (24,450) (6,263)
Deferred tax assets, net, total 22,524 20,451
Deferred tax liabilities, net, total (22,879) (11,005)
Increase (decrease) in valuation allowance $ 18,187 $ 1,066