Property, Plant and Equipment Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 84,939	$ 85,856
Accumulated depreciation and amortization,	(57,606)	(54,949)
Property, plant and equipment, less accumulated depreciation and amortization	27,333	30,907
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,752	2,721
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	16,973	18,981
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	23,277	22,837
Capitalized software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	21,947	21,371
McCook facility
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	12,961	12,961
Accumulated depreciation and amortization,	(7,200)
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	5,634	5,714
Capital leases
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	806	534
Accumulated depreciation and amortization,	(400)
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	214	166
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 375	$ 571