Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Statement [Abstract]
Net Sales	$ 651,436	$ 675,276
Cost of Sales	577,876	566,057
Gross Profit	73,560	109,219
Operating Expenses:
Selling	13,067	15,277
Administrative	22,639	21,572
Research, development and technical services	15,138	16,473
Deferred compensation (income) expense	1,502	(7,501)
Total Operating expenses	52,346	45,821
Business restructuring expenses	(157)	(52)
Operating Income	21,057	63,346
Other Income (Expense):
Interest, net	(2,822)	(2,306)
Other, net (Note 15)	1,668	(1,650)
Nonoperating Income (Expense), Total	(1,154)	(3,956)
Income Before Provision for Income Taxes	19,903	59,390
Provision for Income Taxes	3,761	14,581
Net Income	$ 16,142	$ 44,809
Net Income Per Common Share (Note 10):
Basic	$ 0.71	$ 1.96
Diluted	$ 0.70	$ 1.93
Shares Used to Compute Net Income Per Common Share (Note 10):
Basic	22,757	22,896
Diluted	22,994	23,167