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
Sep. 30, 2017
Dec. 31, 2016
Property, plant and equipment    
Total property, plant and equipment $ 102,145 $ 96,524
Less accumulated depreciation (49,447) (44,383)
Net property, plant and equipment 52,698 52,141
Land    
Property, plant and equipment    
Total property, plant and equipment 2,378 2,378
Land improvements    
Property, plant and equipment    
Total property, plant and equipment 4,357 4,357
Leasehold Improvements    
Property, plant and equipment    
Total property, plant and equipment 4,096 2,569
Buildings    
Property, plant and equipment    
Total property, plant and equipment 26,342 26,058
Machinery and equipment    
Property, plant and equipment    
Total property, plant and equipment 43,928 40,878
Furniture and fixtures    
Property, plant and equipment    
Total property, plant and equipment 13,207 12,561
Mobile equipment and other    
Property, plant and equipment    
Total property, plant and equipment 4,600 3,873
Construction-in-process    
Property, plant and equipment    
Total property, plant and equipment $ 3,237 $ 3,850