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Business Realignment and Restructuring (Schedule of Restructuring and Related Costs) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Particulate Matter Product Line Strategic Exit [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring Reserve, Beginning Balance         $ 0
Charge to expense       $ 2,329 2,894
Cash payments       (2,141) (70)
Utilization, Non-Cash       (188) (2,824)
Restructuring Reserve, Ending Balance   $ 0     0
Canton Facility Restructuring Plan [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring Reserve, Beginning Balance $ 140   $ 165 165 2,636
Charge to expense     13 13 2,881
Cash payments     (38)   (5,308)
Restructuring Reserve, Ending Balance   209 140   209
Control Devices [Member] | Particulate Matter Product Line Strategic Exit [Member]          
Restructuring Cost and Reserve [Line Items]          
Charge to expense 675 342   2,329 2,894
Control Devices [Member] | Canton Facility Restructuring Plan [Member]          
Restructuring Cost and Reserve [Line Items]          
Charge to expense 0 197      
Control Devices [Member] | Cost of Goods Sold [Member] | Particulate Matter Product Line Strategic Exit [Member]          
Restructuring Cost and Reserve [Line Items]          
Charge to expense 605 340   1,505 503
Control Devices [Member] | Cost of Goods Sold [Member] | Canton Facility Restructuring Plan [Member]          
Restructuring Cost and Reserve [Line Items]          
Charge to expense   88     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 (31) 2   642 2,391
Control Devices [Member] | Selling, General and Administrative Expenses [Member] | Canton Facility Restructuring Plan [Member]          
Restructuring Cost and Reserve [Line Items]          
Charge to expense         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 101     182  
Control Devices [Member] | Design and Development Expense [Member] | Canton Facility Restructuring Plan [Member]          
Restructuring Cost and Reserve [Line Items]          
Charge to expense   109   13 673
Electronics [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring Reserve, Beginning Balance     227 227 52
Charge to expense 36 567   256 2,195
Cash payments       (418) (1,977)
Restructuring Reserve, Ending Balance 65 270   65 270
Electronics [Member] | Cost of Goods Sold [Member]          
Restructuring Cost and Reserve [Line Items]          
Charge to expense 34 132   37 132
Electronics [Member] | Selling, General and Administrative Expenses [Member]          
Restructuring Cost and Reserve [Line Items]          
Charge to expense 2 383   176 1,634
Electronics [Member] | Design and Development Expense [Member]          
Restructuring Cost and Reserve [Line Items]          
Charge to expense   52   43 429
Employee Termination [Member] | Particulate Matter Product Line Strategic Exit [Member]          
Restructuring Cost and Reserve [Line Items]          
Charge to expense       139  
Cash payments       (139)  
Employee Termination [Member] | Canton Facility Restructuring Plan [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring Reserve, Beginning Balance 140   165 165 2,636
Charge to expense         1,119
Cash payments     (25)   (3,546)
Restructuring Reserve, Ending Balance   209 140   209
Employee Termination [Member] | Electronics [Member]          
Restructuring Cost and Reserve [Line Items]          
Restructuring Reserve, Beginning Balance     227 227 52
Charge to expense       50 961
Cash payments       (212) (743)
Restructuring Reserve, Ending Balance $ 65 270   65 270
Non-Cash Fixed Asset Charges [Member] | Particulate Matter Product Line Strategic Exit [Member]          
Restructuring Cost and Reserve [Line Items]          
Charge to expense       188  
Utilization, Non-Cash       (188)  
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         2,824
Utilization, Non-Cash         (2,824)
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       2,002 70
Cash payments       (2,002) (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   1,762
Cash payments     $ (13)   (1,762)
Other Restructuring [Member] | Electronics [Member]          
Restructuring Cost and Reserve [Line Items]          
Charge to expense       206 782
Cash payments       $ (206) $ (782)