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, 2018
Dec. 31, 2017
Property, plant and equipment    
Total property, plant and equipment $ 105,715 $ 104,959
Less accumulated depreciation (52,801) (50,997)
Net property, plant and equipment 52,914 53,962
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 4,288 4,183
Buildings    
Property, plant and equipment    
Total property, plant and equipment 26,920 26,846
Machinery and equipment    
Property, plant and equipment    
Total property, plant and equipment 44,892 44,618
Furniture and fixtures    
Property, plant and equipment    
Total property, plant and equipment 14,011 13,681
Mobile equipment and other    
Property, plant and equipment    
Total property, plant and equipment 4,640 4,576
Construction-in-process    
Property, plant and equipment    
Total property, plant and equipment $ 4,229 $ 4,320