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, 2016
Dec. 31, 2015
Property, plant and equipment    
Total property, plant and equipment $ 85,858 $ 81,540
Less accumulated depreciation (41,181) (38,904)
Net property, plant and equipment 44,677 42,636
Land    
Property, plant and equipment    
Total property, plant and equipment 1,500 1,500
Land improvements    
Property, plant and equipment    
Total property, plant and equipment 3,771 3,010
Leasehold Improvements    
Property, plant and equipment    
Total property, plant and equipment 859 859
Buildings    
Property, plant and equipment    
Total property, plant and equipment 24,486 24,476
Machinery and equipment    
Property, plant and equipment    
Total property, plant and equipment 37,042 35,628
Furniture and fixtures    
Property, plant and equipment    
Total property, plant and equipment 11,733 11,657
Mobile equipment and other    
Property, plant and equipment    
Total property, plant and equipment 2,403 2,255
Construction-in-process    
Property, plant and equipment    
Total property, plant and equipment $ 4,064 $ 2,155