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Inventories (Tables)
 9 Months Ended
Sep. 30, 2018
Inventory Disclosure [Abstract]  
Schedule of inventory Net inventories consist of the following:
 
(in thousands)
September 30, 2018December 31, 2017
Finished goods
$154,555 $133,161 
Work in process
14,345 10,243 
Raw materials
15,118 12,164 
Total inventory
$184,018 $155,568