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Restructuring and Business Realignment (Schedule of Business Realignment Charges Classified by Statement of Operations) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]      
Total business realignment costs (benefit) $ 710 $ 1,812 $ 2,617
Cost of Goods Sold [Member]      
Restructuring Cost and Reserve [Line Items]      
Total business realignment costs (benefit) 63 426 437
Selling, General and Administrative Expenses [Member]      
Restructuring Cost and Reserve [Line Items]      
Total business realignment costs (benefit) 491 1,385 1,080
Design and Development Expense [Member]      
Restructuring Cost and Reserve [Line Items]      
Total business realignment costs (benefit) 156 1 1,100
Control Devices [Member]      
Restructuring Cost and Reserve [Line Items]      
Total business realignment costs (benefit) 169    
Control Devices [Member] | Selling, General and Administrative Expenses [Member]      
Restructuring Cost and Reserve [Line Items]      
Severance costs   41  
Control Devices [Member] | Design and Development Expense [Member]      
Restructuring Cost and Reserve [Line Items]      
Severance costs 128    
Electronics [Member]      
Restructuring Cost and Reserve [Line Items]      
Total business realignment costs (benefit) 63 1,223 1,180
Electronics [Member] | Cost of Goods Sold [Member]      
Restructuring Cost and Reserve [Line Items]      
Severance costs   56  
Electronics [Member] | Selling, General and Administrative Expenses [Member]      
Restructuring Cost and Reserve [Line Items]      
Severance costs 63 1,167 196
Electronics [Member] | Design and Development Expense [Member]      
Restructuring Cost and Reserve [Line Items]      
Severance costs     984
PST Segment [Member]      
Restructuring Cost and Reserve [Line Items]      
Total business realignment costs (benefit) 478 589 1,437
PST Segment [Member] | Cost of Goods Sold [Member]      
Restructuring Cost and Reserve [Line Items]      
Severance costs 63 370 437
PST Segment [Member] | Selling, General and Administrative Expenses [Member]      
Restructuring Cost and Reserve [Line Items]      
Severance costs 386 218 884
PST Segment [Member] | Design and Development Expense [Member]      
Restructuring Cost and Reserve [Line Items]      
Severance costs $ 29 $ 1 $ 116