Quarterly report pursuant to Section 13 or 15(d)

Inventories - Schedule of Inventories (Details)

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Inventories - Schedule of Inventories (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 84,726 $ 87,927
Work-in-process 11,252 6,500
Total $ 95,978 $ 94,427