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Business Realignment and Corporate Headquarter Relocation (Schedule of Business Realignment Charges Classified by Statement of Operations) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Restructuring Cost and Reserve [Line Items]        
Total business realignment charges $ 53 $ 211 $ 547 $ 2,422
Cost of Goods Sold [Member]        
Restructuring Cost and Reserve [Line Items]        
Total business realignment charges 17 20    
Design and Development [Member]        
Restructuring Cost and Reserve [Line Items]        
Total business realignment charges 1      
Selling, General and Administrative Expenses [Member]        
Restructuring Cost and Reserve [Line Items]        
Total business realignment charges $ 35 $ 191