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INVENTORIES (Tables)
3 Months Ended
Mar. 31, 2021
INVENTORIES  
Schedule of inventories

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March 31, 

    

December 31, 

(in thousands)

 

2021

​

2020

Raw materials and supplies

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$

22,651

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$

21,754

Work in process

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12,349

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11,378

Finished goods

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10,929

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9,178

Total inventories

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$

45,929

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$

42,310