Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Income Statement [Abstract]
Net Sales	$ 579,975	$ 751,633	$ 1,231,411	$ 1,426,909
Cost of Sales	513,578	620,019	1,091,454	1,186,076
Gross Profit	66,397	131,614	139,957	240,833
Operating Expenses:
Selling	11,109	15,552	24,176	30,829
Administrative	22,589	24,079	45,228	45,651
Research, development and technical services	14,105	16,690	29,243	33,163
Deferred compensation (income) expense	743	(3,406)	2,245	(10,907)
Total Operating expenses	48,546	52,915	100,892	98,736
Goodwill impairment (Note 16)		978		978
Business restructuring expenses	42	81	199	133
Operating Income	17,809	77,640	38,866	140,986
Other Income (Expense):
Interest, net	(3,865)	(2,727)	(6,687)	(5,033)
Other, net (Note 15)	2,370	(5,369)	4,038	(7,019)
Nonoperating Income (Expense), Total	(1,495)	(8,096)	(2,649)	(12,052)
Income Before Provision for Income Taxes	16,314	69,544	36,217	128,934
Provision for Income Taxes	3,630	17,418	7,391	31,999
Net Income	$ 12,684	$ 52,126	$ 28,826	$ 96,935
Net Income Per Common Share (Note 10):
Basic	$ 0.56	$ 2.29	$ 1.27	$ 4.24
Diluted	$ 0.55	$ 2.26	$ 1.25	$ 4.19
Shares Used to Compute Net Income Per Common Share (Note 10):
Basic	22,768	22,792	22,763	22,842
Diluted	22,945	23,055	22,970	23,115