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Inventories
 9 Months Ended
Sep. 30, 2019
Inventory Disclosure [Abstract]  
Inventories

3.

Inventories

At September 30, 2019, and December 31, 2018, approximately 36% 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,

2019

 

 

December 31,

2018

 

Raw materials

 

$

20,032

 

 

$

19,615

 

Work-in-process

 

 

36,359

 

 

 

42,339

 

Finished goods

 

 

19,044

 

 

 

20,650

 

Supplies

 

 

11,541

 

 

 

11,592

 

Inventories

 

$

86,976

 

 

$

94,196