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Inventories (Tables)
6 Months Ended
Jun. 30, 2020
Inventories  
Schedule of inventories

June 30, 

December 31, 

 

2020

2019

 

(in thousands)

 

Raw materials and supplies

    

$

50,657

    

$

59,233

Work in process

 

39,169

 

35,548

Finished goods

 

14,900

 

15,720

Total inventories

$

104,726

$

110,501