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Income Taxes (Components of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Income Taxes [Abstract]    
Deferred tax assets, Accrued postretirement and pension benefits-long-term $ 2,545 $ 4,624
Deferred tax liabilities, Intangible assets (1,669) (2,838)
Deferred tax assets, Accrued expenses 4,104 6,961
Deferred tax assets, Deferred state and local incentive revenue 2,933 4,733
Deferred tax assets, Inventory valuation 1,869 2,621
Deferred tax liabilities, Property, plant and equipment and railcars on operating leases (8,957) (14,897)
Deferred tax assets, Net operating loss and tax credit 13,371 5,731
Deferred tax assets, Stock-based compensation expense 807 2,825
Deferred tax assets, Other 1,085 419
Deferred tax Liabilities, Other (379) (761)
Deferred Tax Assets, Gross, Total 26,714 27,914
Deferred Tax Liabilities, Gross, Total (11,005) (18,496)
Deferred Tax Assets, Valuation Allowance (6,263) (5,197)
Deferred tax assets, net, total 20,451 22,717
Increase (decrease) in valuation allowance $ 1,066 $ (600)