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Inventories
6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Inventories
Inventories
Inventories consist of the following (in thousands):
 
 
June 30, 2018
 
December 31, 2017
Raw materials
 
$
73,710

 
$
87,927

Work-in-process
 
7,594

 
6,500

Total
 
$
81,304

 
$
94,427