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Inventories (Tables)
3 Months Ended
Mar. 31, 2019
Inventory Disclosure [Abstract]  
Inventories
Inventories are summarized below (in thousands):
 
March 31,
2019
 
December 31, 2018
Inventories:
 
 
 
Raw materials
$
72,261

 
$
80,474

Work-in-process
980

 
815

Finished goods
309,057

 
256,768

 
$
382,298

 
$
338,057