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Disposals (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 08, 2021
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Jun. 17, 2021
May 07, 2021
Selling, general and administrative   $ 28,938 $ 31,380 $ 56,337 $ 60,756    
Gain on disposal     30,718   30,718    
SMP [Member]              
Disposal group, net sales     3,070        
Particulate Matter Sensor Assets [Member]              
Agreement date       Mar. 08, 2021      
Purchase price for sale of assets $ 4,000,000            
Post-closing inventory adjustment payment 1,133            
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]              
Disposal group, net sales     2,292   6,307    
Disposal group, operating income     416   867    
Purchase price for sale of assets 3,214            
Particulate Matter Sensor Gen 1 Assets [Member] | SMP [Member]              
Inventory, finished goods, gross     971   971    
Particulate Matter Sensor Gen 1 Assets [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]              
Services provided income per agreement recognized as reduction to selling general and administrative expenses   $ 62 261 $ 211 330    
Disposal group, net sales     $ 2,292   3,070    
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
Canton Facility [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]              
Proceeds from sale of productive assets         35,167    
Gain on disposal         30,718    
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