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Inventories (Tables)
 6 Months Ended
Jun. 30, 2019
Inventory, Net [Abstract]  
Schedule of components of inventories The components of inventories were as follows: 
(in thousands)
June 30,
2019
 
December 31,
2018

 

 
 

Raw materials
$
38,010

 
$
31,973

Work-in-process
19,398

 
17,009

Finished goods
139,468

 
124,321

Inventories
$
196,876

 
$
173,303