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Inventories (Tables)
9 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Inventories
Inventories are summarized below (in thousands):
 
September 30,
2018
 
December 31, 2017
Inventories:
 
 
 
Raw materials
$
62,421

 
$
67,785

Work-in-process
962

 
868

Finished goods
174,089

 
193,833

 
$
237,472

 
$
262,486