Inventories (Tables)

9 Months Ended

Sep. 30, 2018

Inventory Disclosure [Abstract]

Inventories

Inventories consisted of the following:

	Sept. 30, 2018			Sept. 30, 2017			Dec. 31, 2017
	(Dollars in thousands)
Raw materials	$	250,051		$	211,959		$	233,410
Work-in-process	125,336			132,071			124,396
Finished goods	384,815			415,645			433,937
Other	12,999			13,128			12,370
	773,201			772,803			804,113
Adjustment to value inventory    at cost on the LIFO method	(82,823		)	(68,419		)	(82,823		)
	$	690,378		$	704,384		$	721,290