Inventories (Tables)

3 Months Ended

Mar. 31, 2020

Inventory Disclosure [Abstract]

Inventories

Inventories consisted of the following: 

	March 31, 2020		March 31, 2019		Dec. 31, 2019
	(Dollars in thousands)
Raw materials	$	261,058	$	244,859	$	286,953
Work-in-process	148,034		135,685		134,417
Finished goods	432,085		418,702		355,337
Other	13,126		12,850		12,793
	854,303		812,096		789,500
Adjustment to value inventory at cost on the LIFO method	(156,495)		(125,883)		(156,495)
	$	697,808	$	686,213	$	633,005