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Inventories (Tables)
6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of inventories
Inventories consist of the following (in thousands):
 
 
June 30, 2017
 
December 31, 2016
Raw materials
 
$
48,681

 
$
62,037

Work-in-process
 
4,063

 
5,289

Total
 
$
52,744

 
$
67,326