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Business Realignment and Restructuring (Narrative) (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Electronics [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges $ 96 $ 312
Additional restructuring costs 760 760
Control Devices [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges 3,443 5,668
Canton Facility Restructuring Plan [Member] | Control Devices [Member] | Minimum [Member]    
Restructuring Cost and Reserve [Line Items]    
Estimated total cost 2,700 2,700
Canton Facility Restructuring Plan [Member] | Control Devices [Member] | Maximum [Member]    
Restructuring Cost and Reserve [Line Items]    
Estimated total cost 3,900 3,900
Canton Facility Restructuring [Member] | Canton Facility Restructuring Plan [Member] | Control Devices [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges   5,668
Selling, General and Administrative Expenses [Member] | Canton Facility Restructuring Plan [Member] | Canton Facility [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges 280 475
Cost of Goods Sold [Member] | Canton Facility Restructuring Plan [Member] | Canton Facility [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges 2,354 3,606
Design and Development Expense [Member] | Canton Facility Restructuring Plan [Member] | Canton Facility [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges $ 809 $ 1,587