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Inventories
 9 Months Ended
Sep. 30, 2020
Inventory Disclosure [Abstract]  
Inventories

3.

Inventories

At September 30, 2020, and December 31, 2019, 36% and 35%, respectively, of the inventories were valued on the LIFO method with the remaining inventories valued on the FIFO method. Inventories were comprised of the following:

 

 

 

September 30,

2020

 

 

December 31,

2019

 

Raw materials

 

$

18,545

 

 

$

18,011

 

Work-in-process

 

 

33,394

 

 

 

35,942

 

Finished goods

 

 

15,845

 

 

 

17,159

 

Supplies

 

 

10,639

 

 

 

11,177

 

Inventories

 

$

78,423

 

 

$

82,289