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Disposals (Narrative) (Details) - USD ($) $ in Thousands |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 08, 2021 | Mar. 31, 2022 | Mar. 31, 2021 | Jun. 17, 2021 | May 07, 2021
Selling, general and administrative |  | $ 27,399 | $ 29,376 |  |
Particulate Matter Sensor Assets [Member] |  |  |  |  |
Agreement date |  | Mar. 08, 2021 |  |  |
Disposal group, net sales |  |  | 3,045 |  |
Disposal group, operating income |  |  | 508 |  |
Purchase price for sale of assets | $ 4,000,000 |  |  |  |
Post-closing inventory adjustment payment | 1,133 |  |  |  |
Particulate Matter Sensor Assets [Member] | SMP [Member] |  |  |  |  |
Services provided income per agreement recognized as reduction to selling general and administrative expenses |  | $ 68 |  |  |
Particulate Matter Sensor Assets [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] |  |  |  |  |
Selling, general and administrative |  |  | 60 |  |
Particulate Matter Sensor Gen 1 Assets [Member] |  |  |  |  |
Purchase price for sale of assets | 3,214 |  |  |  |
Particulate Matter Sensor Gen 1 Assets [Member] | SMP [Member] |  |  |  |  |
Disposal group, net sales |  |  | 778 |  |
Disposal group, cost of goods sold |  |  | 744 |  |
Particulate Matter Sensor Gen 2 Assets [Member] |  |  |  |  |
Purchase price for sale of assets | $ 786 |  |  |  |
Canton Facility [Member] |  |  |  |  |
Agreement date |  | May 07, 2021 |  |  |
Purchase price for sale of assets |  |  |  | $ 37,900 | $ 38,200
Control Devices [Member] | Particulate Matter Sensor Gen 1 Assets [Member] |  |  |  |  |
Disposal group, net sales |  |  | 971 |  |
Disposal group, cost of goods sold |  |  | 898 |  |
Gain on disposal |  |  | $ 740 |  |

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