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Business Realignment and Restructuring (Schedule of Restructuring and Related Costs) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Particulate Matter Product Line Strategic Exit [Member]      
Restructuring Cost and Reserve [Line Items]      
Charge to expense $ 3,428    
Cash payments (102)    
Utilization, Non-Cash (3,326)    
Control Devices [Member]      
Restructuring Cost and Reserve [Line Items]      
Charge to expense 2,978 $ 12,530  
Control Devices [Member] | Particulate Matter Product Line Strategic Exit [Member]      
Restructuring Cost and Reserve [Line Items]      
Charge to expense 3,428    
Control Devices [Member] | Canton Facility Restructuring Plan [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve, Beginning Balance 2,636    
Charge to expense 2,978 12,530  
Cash payments (5,449) (9,894)  
Utilization, Non-Cash    
Restructuring Reserve, Ending Balance 165 2,636  
Control Devices [Member] | Cost of Goods Sold [Member] | Particulate Matter Product Line Strategic Exit [Member]      
Restructuring Cost and Reserve [Line Items]      
Charge to expense 817    
Control Devices [Member] | Cost of Goods Sold [Member] | Canton Facility Restructuring Plan [Member]      
Restructuring Cost and Reserve [Line Items]      
Charge to expense 1,659    
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 2,611    
Control Devices [Member] | Selling, General and Administrative Expenses [Member] | Canton Facility Restructuring Plan [Member]      
Restructuring Cost and Reserve [Line Items]      
Charge to expense 551    
Control Devices [Member] | Design and Development Expense [Member] | Canton Facility Restructuring Plan [Member]      
Restructuring Cost and Reserve [Line Items]      
Charge to expense 768    
Electronics [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve, Beginning Balance 52 656
Charge to expense 2,400 603 3,539
Cash payments (2,225) (921) (1,703)
Utilization, Non-Cash   (286) (1,180)
Restructuring Reserve, Ending Balance 227 52 656
Electronics [Member] | Cost of Goods Sold [Member]      
Restructuring Cost and Reserve [Line Items]      
Charge to expense 147    
Electronics [Member] | Selling, General and Administrative Expenses [Member]      
Restructuring Cost and Reserve [Line Items]      
Charge to expense 1,774    
Electronics [Member] | Design and Development Expense [Member]      
Restructuring Cost and Reserve [Line Items]      
Charge to expense 479    
Employee Termination [Member] | Control Devices [Member] | Canton Facility Restructuring Plan [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve, Beginning Balance 2,636    
Charge to expense 1,119 8,088  
Cash payments (3,590) (5,452)  
Utilization, Non-Cash    
Restructuring Reserve, Ending Balance 165 2,636  
Employee Termination [Member] | Electronics [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve, Beginning Balance 52 520
Charge to expense 1,034 (18) 1,939
Cash payments (859) (453) (1,419)
Utilization, non-cash   3  
Restructuring Reserve, Ending Balance 227 52 520
Excess and Obsolete Inventory [Member] | Electronics [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve, Beginning Balance    
Charge to expense     823
Utilization, Non-Cash     (823)
Excess and Obsolete Inventory [Member] | Electronics [Member] | Cost of Goods Sold [Member]      
Restructuring Cost and Reserve [Line Items]      
Charge to expense     823
Non-Cash Fixed Asset Charges [Member] | Particulate Matter Product Line Strategic Exit [Member]      
Restructuring Cost and Reserve [Line Items]      
Charge to expense 3,326    
Utilization, Non-Cash (3,326)    
Accelerated Depreciation [Member] | Electronics [Member]      
Restructuring Cost and Reserve [Line Items]      
Charge to expense   289  
Utilization, Non-Cash   (289)  
Intangible Impairment [Member] | Electronics [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve, Beginning Balance    
Charge to expense     200
Utilization, Non-Cash     (200)
Fixed Asset Impairment [Member] | Electronics [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve, Beginning Balance    
Charge to expense     157
Utilization, Non-Cash     (157)
Contract Termination [Member] | Electronics [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve, Beginning Balance   17
Charge to expense 452 9 156
Cash payments (452) (26) (139)
Restructuring Reserve, Ending Balance     17
Other Restructuring [Member] | Particulate Matter Product Line Strategic Exit [Member]      
Restructuring Cost and Reserve [Line Items]      
Charge to expense 102    
Cash payments (102)    
Other Restructuring [Member] | Control Devices [Member] | Canton Facility Restructuring Plan [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve, Beginning Balance    
Charge to expense 1,859 4,442  
Cash payments (1,859) (4,442)  
Utilization, Non-Cash    
Restructuring Reserve, Ending Balance  
Other Restructuring [Member] | Electronics [Member]      
Restructuring Cost and Reserve [Line Items]      
Restructuring Reserve, Beginning Balance   119
Charge to expense 914 323 264
Cash payments $ (914) $ (442) (145)
Restructuring Reserve, Ending Balance     $ 119