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Inventories (Tables)
9 Months Ended
Sep. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of inventories
Inventories consist of the following (in thousands):
 
 
September 30, 2017
 
December 31, 2016
Raw materials
 
$
58,906

 
$
62,037

Work-in-process
 
4,417

 
5,289

Total
 
$
63,323

 
$
67,326