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, 2016
Dec. 31, 2015
Property, plant and equipment    
Total property, plant and equipment $ 93,861 $ 81,540
Less accumulated depreciation (42,576) (38,904)
Net property, plant and equipment 51,285 42,636
Land    
Property, plant and equipment    
Total property, plant and equipment 2,378 1,500
Land improvements    
Property, plant and equipment    
Total property, plant and equipment 4,357 3,010
Leasehold Improvements    
Property, plant and equipment    
Total property, plant and equipment 2,617 859
Buildings    
Property, plant and equipment    
Total property, plant and equipment 25,997 24,476
Machinery and equipment    
Property, plant and equipment    
Total property, plant and equipment 40,143 35,628
Furniture and fixtures    
Property, plant and equipment    
Total property, plant and equipment 12,345 11,657
Mobile equipment and other    
Property, plant and equipment    
Total property, plant and equipment 3,904 2,255
Construction-in-process    
Property, plant and equipment    
Total property, plant and equipment $ 2,120 $ 2,155