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Inventories (Tables)
 6 Months Ended
Jun. 30, 2020
Inventory Disclosure [Abstract]  
Schedule of inventory
Inventories consist of the following at June 30, 2020 and December 31, 2019 (in thousands):
June 30, 2020December 31, 2019
Raw materials (1)$114,884  $124,171  
Work-in-process (1)73,149  65,392  
Finished goods (1)142,507  138,302  
Total$330,540  $327,865  
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(1)The components of inventory shown in the table above are net of allowance for obsolescence.