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Business Realignment (Schedule of Business Realignment Charges Classified by Statement of Operations) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Restructuring Cost and Reserve [Line Items]        
Total business realignment charges $ 520 $ 323 $ 742 $ 494
Cost of Goods Sold [Member]        
Restructuring Cost and Reserve [Line Items]        
Total business realignment charges 26 304 26 394
Selling, General and Administrative Expenses [Member]        
Restructuring Cost and Reserve [Line Items]        
Total business realignment charges 366 $ 19 588 $ 100
Design and Development Expense [Member]        
Restructuring Cost and Reserve [Line Items]        
Total business realignment charges $ 128   $ 128