Inventories (Tables)

6 Months Ended

Jun. 30, 2018

Inventory Disclosure [Abstract]

Inventories

Inventories consisted of the following:

	June 30, 2018			June 30, 2017			Dec. 31, 2017
	(Dollars in thousands)
Raw materials	$	252,792		$	209,183		$	233,410
Work-in-process	136,210			142,043			124,396
Finished goods	514,911			535,204			433,937
Other	12,629			12,876			12,370
	916,542			899,306			804,113
Adjustment to value inventory    at cost on the LIFO method	(82,823		)	(68,419		)	(82,823		)
	$	833,719		$	830,887		$	721,290