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Inventories (Tables)
12 Months Ended
Dec. 31, 2019
Inventories  
Schedule of inventories

 

 

 

 

 

 

 

    

    

December 31, 

    

December 31, 

 

 

 

2018

 

2019

 

 

 

(in thousands)

 

 

 

 

 

 

Finished goods

 

$

41,557

 

41,310

Work in process

 

 

77,159

 

72,070

Raw materials

 

 

43,028

 

29,729

Supplies

 

 

817

 

665

 

 

$

162,561

 

143,774