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Disposals (Narrative) (Details) - USD ($) $ in Thousands			3 Months Ended			6 Months Ended
	Jun. 17, 2021	Mar. 08, 2021	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	May 07, 2021
Selling, general and administrative			$ 31,380		$ 27,693	$ 60,756	$ 57,196
Gain on disposal			30,718			$ 30,718
Particulate Matter Sensor Assets [Member]
Agreement date						Mar. 08, 2021
Disposal group, net sales			2,292		1,382	$ 6,307	3,763
Disposal group, operating income			416		$ (114)	867	$ (70)
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			261			330
Disposal group, net sales			$ 2,292			3,070
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] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | SMP [Member]
Disposal group, net sales						$ 971
Particulate Matter Sensor Gen 2 Assets [Member]
Purchase price for sale of assets		$ 786
Canton Facility [Member]
Agreement date						May 07, 2021
Proceeds from sale of productive assets	$ 35,167
Gain on disposal	30,718
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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