Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Statement [Abstract]
Net Sales	$ 546,842	$ 562,226	$ 1,654,665	$ 1,793,637
Cost of Sales	471,157	490,990	1,439,147	1,582,444
Gross Profit	75,685	71,236	215,518	211,193
Operating Expenses:
Selling	11,394	11,811	34,610	35,987
Administrative	26,254	22,904	73,513	68,132
Research, development and technical services	13,532	14,477	41,881	43,720
Deferred compensation expense (income)	556	(3,101)	2,729	(856)
Total Operating expenses	51,736	46,091	152,733	146,983
Business restructuring expense (Note 18)		5,628		5,827
Operating Income	23,949	19,517	62,785	58,383
Other Income (Expense):
Interest, net	(3,621)	(2,987)	(9,353)	(9,674)
Other, net (Note 15)	989	(690)	4,551	3,348
Nonoperating Income (Expense), Total	(2,632)	(3,677)	(4,802)	(6,326)
Income Before Provision for Income Taxes	21,317	15,840	57,983	52,057
Provision for Income Taxes	(2,289)	3,269	10,963	10,660
Net Income	$ 23,606	$ 12,571	$ 47,020	$ 41,397
Net Income Per Common Share (Note 10):
Basic	$ 1.03	$ 0.55	$ 2.06	$ 1.82
Diluted	$ 1.03	$ 0.55	$ 2.05	$ 1.8
Shares Used to Compute Net Income Per Common Share (Note 10):
Basic	22,836	22,786	22,829	22,770
Diluted	22,923	22,930	22,936	22,956