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Business Realignment and Restructuring (Schedule of Restructuring and Related Costs) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Particulate Matter Product Line Strategic Exit [Member]    
Restructuring Cost and Reserve [Line Items]    
Charge to expense $ 1,369  
Cash payments (1,184)  
Utilization, Non-Cash (185)  
Canton Facility Restructuring Plan [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve, Beginning Balance 165 $ 2,636
Charge to expense 13 2,222
Cash payments (38) (4,541)
Restructuring Reserve, Ending Balance 140 317
Control Devices [Member] | Particulate Matter Product Line Strategic Exit [Member]    
Restructuring Cost and Reserve [Line Items]    
Charge to expense 1,369  
Control Devices [Member] | Canton Facility Restructuring Plan [Member]    
Restructuring Cost and Reserve [Line Items]    
Charge to expense 13 2,222
Control Devices [Member] | Cost of Goods Sold [Member] | Particulate Matter Product Line Strategic Exit [Member]    
Restructuring Cost and Reserve [Line Items]    
Charge to expense 650  
Control Devices [Member] | Cost of Goods Sold [Member] | Canton Facility Restructuring Plan [Member]    
Restructuring Cost and Reserve [Line Items]    
Charge to expense   1,490
Control Devices [Member] | Selling, General and Administrative Expenses [Member] | Particulate Matter Product Line Strategic Exit [Member]    
Restructuring Cost and Reserve [Line Items]    
Charge to expense 638  
Control Devices [Member] | Selling, General and Administrative Expenses [Member] | Canton Facility Restructuring Plan [Member]    
Restructuring Cost and Reserve [Line Items]    
Charge to expense   314
Control Devices [Member] | Design and Development Expense [Member] | Particulate Matter Product Line Strategic Exit [Member]    
Restructuring Cost and Reserve [Line Items]    
Charge to expense 81  
Control Devices [Member] | Design and Development Expense [Member] | Canton Facility Restructuring Plan [Member]    
Restructuring Cost and Reserve [Line Items]    
Charge to expense   418
Electronics [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve, Beginning Balance 227 52
Charge to expense 199 7
Cash payments (194) (7)
Restructuring Reserve, Ending Balance 232 52
Electronics [Member] | Cost of Goods Sold [Member]    
Restructuring Cost and Reserve [Line Items]    
Charge to expense (2)  
Electronics [Member] | Selling, General and Administrative Expenses [Member]    
Restructuring Cost and Reserve [Line Items]    
Charge to expense 155  
Electronics [Member] | Design and Development Expense [Member]    
Restructuring Cost and Reserve [Line Items]    
Charge to expense 46  
Employee Termination [Member] | Particulate Matter Product Line Strategic Exit [Member]    
Restructuring Cost and Reserve [Line Items]    
Charge to expense 76  
Cash payments (76)  
Employee Termination [Member] | Canton Facility Restructuring Plan [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve, Beginning Balance 165 2,636
Charge to expense   1,118
Cash payments (25) (3,437)
Restructuring Reserve, Ending Balance 140 317
Employee Termination [Member] | Electronics [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Reserve, Beginning Balance 227 52
Charge to expense 53  
Cash payments (48)  
Restructuring Reserve, Ending Balance 232 52
Non-Cash Fixed Asset Charges [Member] | Particulate Matter Product Line Strategic Exit [Member]    
Restructuring Cost and Reserve [Line Items]    
Charge to expense 185  
Utilization, Non-Cash (185)  
Other Restructuring [Member] | Particulate Matter Product Line Strategic Exit [Member]    
Restructuring Cost and Reserve [Line Items]    
Charge to expense 1,108  
Cash payments (1,108)  
Other Restructuring [Member] | Canton Facility Restructuring Plan [Member]    
Restructuring Cost and Reserve [Line Items]    
Charge to expense 13 1,104
Cash payments (13) (1,104)
Other Restructuring [Member] | Electronics [Member]    
Restructuring Cost and Reserve [Line Items]    
Charge to expense 146 7
Cash payments $ (146) $ (7)