CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
Net sales	$ 247,231	$ 238,263	$ 747,467	$ 702,434
Cost of sales	169,167	146,609	497,491	431,448
Gross margin	78,064	91,654	249,976	270,986
Selling, general and administrative expenses	50,653	47,886	164,496	135,258
Research and development expenses	9,140	7,531	25,450	22,195
Restructuring and impairment charges	373	1,007	1,119	3,260
Other operating (income) expense, net	(578)	1,431	(2,852)	3,536
Operating income	18,476	33,799	61,763	106,737
Equity income in unconsolidated joint ventures	1,162	1,773	4,237	5,884
Pension settlement charges	0	(534)	0	(534)
Other income (expense), net	977	(469)	1,563	3,738
Interest expense, net	(2,942)	(441)	(5,559)	(1,452)
Income before income tax expense	17,673	34,128	62,004	114,373
Income tax expense	2,835	8,999	12,683	29,371
Net income	$ 14,838	$ 25,129	$ 49,321	$ 85,002
Basic earnings per share (in dollars per share)	$ 0.79	$ 1.34	$ 2.62	$ 4.54
Diluted earnings per share (in dollars per share)	$ 0.78	$ 1.33	$ 2.60	$ 4.51
Shares used in computing:
Basic earnings per share (in shares)	18,818	18,740	18,804	18,727
Diluted earnings per share (in shares)	18,999	18,874	18,997	18,831