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Inventories (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Inventories [Abstract]    
Raw materials and supplies $ 33,619 $ 30,687
Work-in-process 25,594 19,821
Finished goods 11,316 23,494
Total inventories $ 70,529 $ 74,002