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Disposal of Particulate Matter Sensor Business (Disposal of Non-Core Products) (Details) - USD ($) $ in Thousands		3 Months Ended
	Mar. 08, 2021	Mar. 31, 2021	Mar. 31, 2020
Selling, general and administrative		$ 29,376	$ 29,503
Particulate Matter Sensor Assets [Member]
Asset Purchase Agreement date		Mar. 08, 2021
Services provided income per agreement recognized as reduction to selling general and administrative expenses		$ 68
Disposal group, net sales		3,045	2,381
Disposal group, operating income		508	$ (103)
Purchase price for sale of assets	$ 4,000,000
Post-closing inventory adjustment payment	1,133
Particulate Matter Sensor Assets [Member] | SMP [Member]
Disposal group, net sales		778
Disposal group, cost of goods sold		744
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 2 Assets [Member]
Purchase price for sale of assets	$ 786
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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 20
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=109222650&loc=SL51721683-107760

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