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Inventories (Tables)
9 Months Ended
Sep. 30, 2018
Inventory, Net [Abstract]  
Schedule of components of inventories
The components of inventories were as follows (in thousands)


September 30,
2018
 
December 31,
2017

 

 
 

Raw materials
$
33,068

 
$
32,994

Work-in-process
17,696

 
17,786

Finished goods
128,920

 
113,538

Inventories (Note 2)
$
179,684

 
$
164,318