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v3.21.1

Business Realignment and Restructuring (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Electronics [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring expense | $ 199 | $ 7
Additional restructuring costs | 660 |
Particulate Matter Product Line Strategic Exit [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring expense | 1,369 |
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] | Minimum [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Estimated total cost | 800 |
Particulate Matter Product Line Strategic Exit [Member] | Control Devices [Member] | Maximum [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Estimated total cost | 3,600 |
Canton Facility Restructuring Plan [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring expense | 13 | 2,222
Canton Facility Restructuring Plan [Member] | Control Devices [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring expense | 13 | 2,222
Employee Termination [Member] | Electronics [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring expense | 53 |
Employee Termination [Member] | Particulate Matter Product Line Strategic Exit [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring expense | 76 |
Employee Termination [Member] | Canton Facility Restructuring Plan [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring expense |  | 1,118
Other Restructuring [Member] | Electronics [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring expense | 146 | 7
Other Restructuring [Member] | Particulate Matter Product Line Strategic Exit [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring expense | 1,108 |
Other Restructuring [Member] | Canton Facility Restructuring Plan [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring expense | 13 | 1,104
Selling, General and Administrative Expenses [Member] | Electronics [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring expense | 155 |
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 |
Selling, General and Administrative Expenses [Member] | Canton Facility Restructuring Plan [Member] | Control Devices [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring expense |  | 314
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 |
Cost of Goods Sold [Member] | Canton Facility Restructuring Plan [Member] | Control Devices [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring expense |  | 1,490
Design and Development Expense [Member] | Electronics [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring expense | 46 |
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] | Canton Facility [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring expense | $ 13 |
Design and Development Expense [Member] | Canton Facility Restructuring Plan [Member] | Control Devices [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring expense |  | $ 418

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