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INVENTORIES - Summary of inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
INVENTORIES    
Raw materials and supplies $ 27,686 $ 26,874
Work in process 10,640 10,671
Finished goods 9,498 9,225
Total inventories $ 47,824 $ 46,770 [1]
[1] Note 1