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Inventories - Schedule of Inventory Current (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Finished goods $ 62,004 $ 81,194
Work-in-progress 57,504 52,578
Raw materials 99,638 82,734
Total $ 219,146 $ 216,506