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Inventories (Tables)
 6 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of Inventory
As of June 30, 2020 and December 31, 2019, Inventories consisted of the following:
(in thousands)
June 30, 2020December 31, 2019
Raw materials
$64,897  $52,960  
Work in process
39,096  31,744  
Finished goods
11,539  10,445  
Total inventories
$115,532  $95,149