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Inventories (Tables)
 9 Months Ended
Sep. 30, 2017
Inventory Disclosure [Abstract]  
Schedule of inventory
Net inventories consist of the following:

 
 
(in thousands)
September 30,
2017
December 31,
2016
 
 
 
 
 
 
 
Finished goods
 
$
137,064

 
 
$
116,667

 
Work in process
 
9,707

 
 
9,431

 
Raw materials
 
12,800

 
 
9,662

 
Total inventory
 
$
159,571

 
 
$
135,760