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Inventories
3 Months Ended
Mar. 31, 2018
Inventory Disclosure [Abstract]  
Inventories
Inventories
Inventories consist of the following (in thousands):
 
 
March 31, 2018
 
December 31, 2017
Raw materials
 
$
82,134

 
$
87,927

Work-in-process
 
5,768

 
6,500

Total
 
$
87,902

 
$
94,427