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Inventories (Tables)
6 Months Ended
Jun. 30, 2019
Inventory Disclosure [Abstract]  
Schedule of Inventory
Inventories consist of the following (in thousands):
 
June 30, 2019
 
December 31, 2018
Finished goods
$
55,674

 
$
55,120

Raw materials
56,963

 
62,766

Work in process
11,084

 
10,237

Inventories, net
$
123,721

 
$
128,123