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Business Realignment and Restructuring (Schedule of Restructuring and Related Costs) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Particulate Matter Product Line Strategic Exit [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring Reserve, Beginning Balance       $ 0
Charge to expense     $ 1,654 2,552
Cash payments     (1,469) (70)
Utilization, Non-Cash     (185) (2,482)
Restructuring Reserve, Ending Balance   $ 0   0
Canton Facility Restructuring Plan [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring Reserve, Beginning Balance     165 2,636
Charge to expense     13 2,683
Cash payments     (38) (5,319)
Restructuring Reserve, Ending Balance $ 140   140  
Control Devices [Member] | Particulate Matter Product Line Strategic Exit [Member]        
Restructuring Cost and Reserve [Line Items]        
Charge to expense 285 2,552 1,654 2,552
Control Devices [Member] | Canton Facility Restructuring Plan [Member]        
Restructuring Cost and Reserve [Line Items]        
Charge to expense 0 461    
Control Devices [Member] | Cost of Goods Sold [Member] | Particulate Matter Product Line Strategic Exit [Member]        
Restructuring Cost and Reserve [Line Items]        
Charge to expense 250 164 900 164
Control Devices [Member] | Cost of Goods Sold [Member] | Canton Facility Restructuring Plan [Member]        
Restructuring Cost and Reserve [Line Items]        
Charge to expense   80   1,570
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 35 2,388 673 2,388
Control Devices [Member] | Selling, General and Administrative Expenses [Member] | Canton Facility Restructuring Plan [Member]        
Restructuring Cost and Reserve [Line Items]        
Charge to expense   235   549
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   146 13 564
Electronics [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring Reserve, Beginning Balance     227 52
Charge to expense 21 1,621 220 1,628
Cash payments     (382) (1,084)
Restructuring Reserve, Ending Balance 65 596 65 596
Electronics [Member] | Cost of Goods Sold [Member]        
Restructuring Cost and Reserve [Line Items]        
Charge to expense 5   3  
Electronics [Member] | Selling, General and Administrative Expenses [Member]        
Restructuring Cost and Reserve [Line Items]        
Charge to expense 19 1,244 174 1,251
Electronics [Member] | Design and Development Expense [Member]        
Restructuring Cost and Reserve [Line Items]        
Charge to expense (3) 377 43 377
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       1,119
Cash payments     (25) (3,755)
Restructuring Reserve, Ending Balance 140   140  
Employee Termination [Member] | Electronics [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring Reserve, Beginning Balance     227 52
Charge to expense     50 863
Cash payments     (212) (319)
Restructuring Reserve, Ending Balance $ 65 596 65 596
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)  
Fixed Asset Impairment [Member] | Particulate Matter Product Line Strategic Exit [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring Reserve, Beginning Balance       0
Charge to expense       2,482
Utilization, Non-Cash       (2,482)
Restructuring Reserve, Ending Balance   0   0
Contract Termination [Member] | Electronics [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring Reserve, Beginning Balance       0
Charge to expense       452
Cash payments       (452)
Utilization, Non-Cash       0
Restructuring Reserve, Ending Balance   0   0
Other Restructuring [Member] | Particulate Matter Product Line Strategic Exit [Member]        
Restructuring Cost and Reserve [Line Items]        
Restructuring Reserve, Beginning Balance       0
Charge to expense     1,393 70
Cash payments     (1,393) (70)
Restructuring Reserve, Ending Balance   $ 0   0
Other Restructuring [Member] | Canton Facility Restructuring Plan [Member]        
Restructuring Cost and Reserve [Line Items]        
Charge to expense     13 1,564
Cash payments     (13) (1,564)
Other Restructuring [Member] | Electronics [Member]        
Restructuring Cost and Reserve [Line Items]        
Charge to expense     170 313
Cash payments     $ (170) $ (313)