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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Finished goods $ 95,485 $ 86,555
Work-in-process 19,265 12,799
Raw materials 51,966 55,934
Total Inventories $ 166,716 $ 155,288