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Property, Plant and Equipment (Schedule of Property, Plant and Equipment) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Total cost $ 94,406 $ 96,071
Less: Accumulated depreciation and amortization (56,153) (49,724)
Total property, plant and equipment, net 38,253 46,347
Land [Member]    
Property, Plant and Equipment [Line Items]    
Total cost 140 151
Buildings and Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total cost 670 1,398
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total cost 14,945 14,888
Machinery and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total cost 69,442 69,960
Software [Member]    
Property, Plant and Equipment [Line Items]    
Total cost 8,979 9,034
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Total cost $ 230 $ 640