Quarterly report pursuant to Section 13 or 15(d)

Inventories (Details)

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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Inventories    
Finished goods and work-in-process $ 49,647 $ 40,984
Raw material and supplies 10,649 10,600
Inventories $ 60,296 $ 51,584