Inventories (Tables)

12 Months Ended

Dec. 31, 2017

Inventory Disclosure [Abstract]

Inventories

The components of inventories at December 31 were as follows:

	2017			2016
	(Dollars in thousands)
Raw materials	$	233,410		$	179,451
Work-in-process	124,396			121,331
Finished goods	433,937			355,072
Other	12,370			15,528
	804,113			671,382
Adjustment to value inventory at cost on the LIFO method	(82,823		)	(68,419		)
	$	721,290		$	602,963