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Inventories (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Finished goods $ 117,112 $ 117,703
Work-in-process 20,192 14,380
Raw materials 61,618 65,453
Total Inventories $ 198,922 $ 197,536