Annual report pursuant to Section 13 and 15(d)

Inventories - Schedule of Inventories (Details)

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Inventories - Schedule of Inventories (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials $ 87,927 $ 62,037
Work-in-process 6,500 5,289
Total $ 94,427 $ 67,326