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INVENTORIES (Tables)
9 Months Ended
Sep. 30, 2021
INVENTORIES  
Schedule of inventories include costs of materials, direct labor and manufacturing overhead, and are stated at the lower of cost (first-in, first-out basis) or net realizable value

Inventories include costs of materials, direct labor and manufacturing overhead, and are stated at the lower of cost (first-in, first-out basis) or net realizable value, as follows (in thousands):

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September 30, 

    

December 31, 

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2021

​

2020

Parts and raw materials

​

$

54,077

​

$

44,750

Work-in-process

​

 

7,785

​

 

6,186

Finished goods

​

 

10,377

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12,042

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​

$

72,239

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$

62,978