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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