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Inventories
 6 Months Ended
Jun. 30, 2017
Inventory Disclosure [Abstract]  
Inventories
Inventories
Inventories are as follows (in thousands):
 
June 30, 2017
 
December 31, 2016
Raw materials
$
42,668

 
$
28,626

Work-in-process
2,933

 
2,918

Finished goods
32,809

 
26,739

Inventories
$
78,410

 
$
58,283