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INVENTORIES - Summary of inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
INVENTORIES    
Raw materials and supplies $ 22,499 $ 17,058
Work in process 7,393 7,562
Finished goods 4,700 8,018
Total inventories $ 34,592 $ 32,638