Property and Equipment, Net (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, plant and equipment
Property and equipment, gross	$ 71,253	$ 71,980
Less: Accumulated depreciation	60,271	60,697
Property, plant and equipment, excluding construction in progress, net	10,982	11,283
Construction in progress	1,049	493
Total	12,031	11,776
Depreciation expense	2,400	1,900	$ 2,100
Railroad and equipment
Property, plant and equipment
Property and equipment, gross	33,626	33,626
Furniture and fixtures
Property, plant and equipment
Property and equipment, gross	22,438	22,552
Machinery and equipment
Property, plant and equipment
Property and equipment, gross	8,964	9,468
Office equipment
Property, plant and equipment
Property and equipment, gross	5,237	5,322
Autos and trucks
Property, plant and equipment
Property and equipment, gross	$ 988	$ 1,012

Property, plant and equipment, excluding construction in progress, net.

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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