Inventories

3 Months Ended

Mar. 31, 2018

Inventory Disclosure [Abstract]

Inventories

Inventories

Inventories consisted of the following:

	March 31, 2018			March 31, 2017			Dec. 31, 2017
	(Dollars in thousands)
Raw materials	$	230,847		$	187,897		$	233,410
Work-in-process	133,271			125,941			124,396
Finished goods	449,133			452,931			433,937
Other	12,858			14,504			12,370
	826,109			781,273			804,113
Adjustment to value inventory    at cost on the LIFO method	(82,823		)	(68,419		)	(82,823		)
	$	743,286		$	712,854		$	721,290