Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Inventories (Details)

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Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Finished goods $ 61,391 $ 63,234
Work-in-process 2,616 2,271
Raw materials 59,517 50,212
Total Inventory $ 123,524 $ 115,717