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Inventories
 6 Months Ended
Jun. 30, 2018
Inventory Disclosure [Abstract]  
Inventories

2.

Inventories

At June 30, 2018, and December 31, 2017, approximately 39% and 42% of the inventories were valued on the LIFO method with the remaining inventories valued on the FIFO method. Inventories were comprised of the following:

 

 

 

June 30,

2018

 

 

December 31,

2017

 

Raw materials

 

$

22,717

 

 

$

24,249

 

Work-in-process

 

 

46,692

 

 

 

42,840

 

Finished goods

 

 

24,516

 

 

 

24,083

 

Supplies

 

 

18,031

 

 

 

16,389

 

Inventories

 

$

111,956

 

 

$

107,561