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Inventories (Tables)
9 Months Ended
Sep. 30, 2021
Inventories  
Schedule of inventories

September 30, 

December 31, 

 

2021

2020

 

(in thousands)

 

Raw materials and supplies

    

$

45,752

    

$

47,051

Work in process

 

37,555

 

37,257

Finished goods

 

16,933

 

12,523

Total inventories

$

100,240

$

96,831