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Inventories (Tables)
 6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Schedule of inventory Net inventories consist of the following:
 
(in thousands)
June 30,
2018		December 31,
2017
Finished goods $149,645 $133,161 
Work in process 10,434 10,243 
Raw materials 14,757 12,164 
Total inventory$174,836 $155,568