Property, Plant and Equipment (Schedule of Property, Plant and Equipment) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Total cost	$ 102,399	$ 111,235
Less: Accumulated depreciation and amortization	(63,835)	(65,918)
Total property, plant and equipment, net	38,564	45,317
Buildings and Improvements [Member]
Property, Plant and Equipment [Line Items]
Total cost	229	229
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Total cost	8,590	14,988
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Total cost	81,478	86,542
Software [Member]
Property, Plant and Equipment [Line Items]
Total cost	9,663	9,011
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Total cost	$ 2,439	$ 465