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INVENTORIES - Summary of inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
INVENTORIES    
Raw materials and supplies $ 24,008 $ 26,106
Work in process 7,950 9,007
Finished goods 9,484 7,375
Total inventories $ 41,442 $ 42,488