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Inventories (Tables)
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Inventories
Inventories are summarized below (in thousands):
 
June 30,
2019
 
December 31, 2018
Inventories:
 
 
 
Raw materials
$
70,247

 
$
80,474

Work-in-process
1,149

 
815

Finished goods
289,071

 
256,768

 
$
360,467

 
$
338,057