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Inventories (Tables)
12 Months Ended
Dec. 31, 2020
Inventories  
Schedule of inventories

 

 

 

 

 

 

 

    

    

December 31, 

    

December 31, 

 

 

 

2019

 

2020

 

 

 

(in thousands)

 

 

 

 

 

 

Finished goods

 

$

41,310

 

23,990

Work in process

 

 

72,070

 

63,025

Raw materials

 

 

29,729

 

21,346

Supplies

 

 

665

 

346

 

 

$

143,774

 

108,707