Property, Plant and Equipment Schedule of property, plant and equipment (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 97,797	$ 108,672
Accumulated depreciation and amortization,	(38,823)	(41,691)
Property, plant and equipment, less accumulated depreciation and amortization	58,974	66,981	52,672
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	5,864	5,952
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	30,885	31,087
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	22,989	25,632
Capitalized software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	18,234	16,798
McCook facility
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	12,961	12,961
Accumulated depreciation and amortization,		(2,000)
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,424	6,931
Capital leases
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,007	1,694
Accumulated depreciation and amortization,		(900)
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	164	131
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,269	$ 7,486