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Business Realignment and Restructuring (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Electronics [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring expense $ 199 $ 199
Particulate Matter Product Line Strategic Exit [Member] | Control Devices [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring expense   1,369
Particulate Matter Product Line Strategic Exit [Member] | Control Devices [Member] | Maximum [Member]    
Restructuring Cost and Reserve [Line Items]    
Estimated total cost 4,200  
Canton Facility Restructuring Plan [Member] | Control Devices [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring expense   13
Employee Severance [Member] | Electronics [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring expense   53
Employee Severance [Member] | Particulate Matter Product Line Strategic Exit [Member] | Control Devices [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring expense   76
Fixed Asset Impairment [Member] | Particulate Matter Product Line Strategic Exit [Member] | Control Devices [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring expense   185
Other Restructuring [Member] | Electronics [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring expense   146
Other Restructuring [Member] | Particulate Matter Product Line Strategic Exit [Member] | Control Devices [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring expense   1,108
Other Restructuring [Member] | Canton Facility Restructuring Plan [Member] | Control Devices [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring expense   13
Selling, General and Administrative Expenses [Member] | Particulate Matter Product Line Strategic Exit [Member] | Control Devices [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring expense   638
Cost of Goods Sold [Member] | Electronics [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring expense $ (2)  
Cost of Goods Sold [Member] | Particulate Matter Product Line Strategic Exit [Member] | Control Devices [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring expense   650
Design and Development Expense [Member] | Particulate Matter Product Line Strategic Exit [Member] | Control Devices [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring expense   81
Design and Development Expense [Member] | Canton Facility Restructuring Plan [Member] | Control Devices [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring expense   $ 13