Quarterly report pursuant to Section 13 or 15(d)

Property, plant and equipment (Details)

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Property, plant and equipment (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Property, plant and equipment    
Total property, plant and equipment $ 150,781 $ 149,473
Less accumulated depreciation (85,146) (82,686)
Net property, plant and equipment 65,635 66,787
Land    
Property, plant and equipment    
Total property, plant and equipment 3,969 3,969
Land improvements    
Property, plant and equipment    
Total property, plant and equipment 5,330 5,278
Leasehold Improvements    
Property, plant and equipment    
Total property, plant and equipment 5,423 5,405
Buildings    
Property, plant and equipment    
Total property, plant and equipment 35,226 34,635
Machinery and equipment    
Property, plant and equipment    
Total property, plant and equipment 70,026 68,939
Furniture and fixtures    
Property, plant and equipment    
Total property, plant and equipment 22,587 22,275
Mobile equipment and other    
Property, plant and equipment    
Total property, plant and equipment 4,724 4,737
Construction-in-process    
Property, plant and equipment    
Total property, plant and equipment $ 3,496 $ 4,235