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INVENTORIES
6 Months Ended
Jun. 30, 2019
INVENTORIES  
INVENTORIES

9.    INVENTORIES

Inventories consist of the following:

    

June 30, 

    

December 31, 

(in thousands)

2019

2018

Raw materials and supplies

$

33,940

$

26,874

Work in process

 

8,903

 

10,671

Finished goods

 

8,061

 

9,225

Total inventories

$

50,904

$

46,770