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Property, Plant and Equipment (Schedule of Property, Plant and Equipment) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Property, Plant and Equipment [Line Items]    
Total cost $ 45,391 $ 102,399
Less: Accumulated depreciation and amortization (25,749) (63,835)
Total property, plant and equipment, net 19,642 38,564
Buildings and Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total cost 162 229
Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Total cost 3,341 8,590
Machinery and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Total cost 33,243 81,478
Software [Member]    
Property, Plant and Equipment [Line Items]    
Total cost 8,560 9,663
Construction in Progress [Member]    
Property, Plant and Equipment [Line Items]    
Total cost $ 85 $ 2,439