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Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Finished goods $ 103,258 $ 86,555
Work-in-process 20,546 12,799
Raw materials 57,635 55,934
Total Inventories $ 181,439 $ 155,288