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INVENTORIES - Summary of inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
INVENTORIES    
Raw materials and supplies $ 27,620 $ 20,116
Work in process 10,799 8,300
Finished goods 6,512 9,590
Total inventories $ 44,931 $ 38,006