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INVENTORIES (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Jan. 01, 2018
Dec. 31, 2017
Inventories, by component      
Raw materials $ 107,540   $ 99,196
Work in process 112,643   107,307
Finished goods 122,987   130,713
Total $ 343,170 $ 322,579 $ 337,216