Inventories (Tables)

9 Months Ended

Sep. 30, 2021

Inventory Disclosure [Abstract]

Inventories

Inventories consisted of the following: 

	Sept. 30, 2021		Sept. 30, 2020		Dec. 31, 2020
	(Dollars in thousands)
Raw materials	$	333,202	$	294,896	$	270,066
Work-in-process	152,429		154,157		167,100
Finished goods	370,134		370,406		335,346
Other	16,005		15,217		14,610
	871,770		834,676		787,122
Adjustment to value inventory at cost on the LIFO method	(109,588)		(156,495)		(109,588)
	$	762,182	$	678,181	$	677,534