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INVENTORIES - Summary of inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
INVENTORIES    
Raw materials and supplies $ 27,520 $ 26,106
Work in process 8,241 9,007
Finished goods 5,460 7,375
Total inventories $ 41,221 $ 42,488