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, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Finished goods $ 63,234 $ 62,728
Work-in-process 2,271 2,389
Raw materials 50,212 52,404
Total Inventory $ 115,717 $ 117,521