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INVENTORIES - Summary of inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
INVENTORIES    
Raw materials and supplies $ 24,389 $ 17,058
Work in process 8,204 7,562
Finished goods 5,105 8,018
Total inventories $ 37,698 $ 32,638