Inventories

6 Months Ended

Jun. 30, 2019

Inventory Disclosure [Abstract]

Inventories

3. Inventories

At June 30, 2019, and December 31, 2018, approximately 34% and 36%, 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:

	June 30, 2019		December 31, 2018
Raw materials	$	20,979	$	19,615
Work-in-process		40,886		42,339
Finished goods		20,222		20,650
Supplies		11,522		11,592
Inventories	$	93,609	$	94,196