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Inventories (Tables)
 6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Schedule of components of inventory
Inventories are as follows (in thousands):
 
June 30, 2018
 
December 31, 2017
Raw materials
$
42,716

 
$
42,750

Work-in-process
3,380

 
3,284

Finished goods
46,690

 
30,293

Inventories
92,786

 
76,327

Less reserve for excess and obsolete inventory
(1,942
)
 
(568
)
Inventories, net
$
90,844

 
$
75,759