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Business Realignment and Restructuring (Narrative) (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Electronics [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges $ 157 $ 469
Additional restructuring costs 600 600
Control Devices [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges 3,607 9,275
Canton Facility Restructuring Plan [Member] | Control Devices [Member] | Minimum [Member]    
Restructuring Cost and Reserve [Line Items]    
Estimated total cost 1,900 1,900
Canton Facility Restructuring Plan [Member] | Control Devices [Member] | Maximum [Member]    
Restructuring Cost and Reserve [Line Items]    
Estimated total cost 3,000 3,000
Canton Facility Restructuring [Member] | Canton Facility Restructuring Plan [Member] | Control Devices [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges   9,275
Selling, General and Administrative Expenses [Member] | Canton Facility Restructuring Plan [Member] | Canton Facility [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges 287 762
Cost of Goods Sold [Member] | Canton Facility Restructuring Plan [Member] | Canton Facility [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges 2,567 6,173
Design and Development Expense [Member] | Canton Facility Restructuring Plan [Member] | Canton Facility [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges $ 753 $ 2,340