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
Jun. 30, 2017
Dec. 31, 2016
Property, plant and equipment    
Total property, plant and equipment $ 100,358 $ 96,524
Less accumulated depreciation (47,732) (44,383)
Net property, plant and equipment 52,626 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 3,959 2,569
Buildings    
Property, plant and equipment    
Total property, plant and equipment 26,175 26,058
Machinery and equipment    
Property, plant and equipment    
Total property, plant and equipment 42,723 40,878
Furniture and fixtures    
Property, plant and equipment    
Total property, plant and equipment 13,042 12,561
Mobile equipment and other    
Property, plant and equipment    
Total property, plant and equipment 4,373 3,873
Construction-in-process    
Property, plant and equipment    
Total property, plant and equipment $ 3,351 $ 3,850