CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - 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	$ 230,821	$ 251,970	$ 474,668	$ 500,236
Cost of sales	151,204	165,452	315,350	328,324
Gross margin	79,617	86,518	159,318	171,912
Selling, general and administrative expenses	46,128	56,138	106,213	113,843
Research and development expenses	8,098	8,050	17,684	16,310
Restructuring and impairment charges	3,939	677	14,440	746
Other operating (income) expense, net	(6,442)	(1,743)	(6,661)	(2,274)
Operating income	27,894	23,396	27,642	43,287
Equity income in unconsolidated joint ventures	842	1,800	918	3,075
Other income (expense), net	(757)	319	(752)	586
Interest expense, net	(2,837)	(1,548)	(6,299)	(2,617)
Income before income taxes	25,142	23,967	21,509	44,331
Income tax expense (benefit)	7,278	6,084	7,150	9,848
Net income	$ 17,864	$ 17,883	$ 14,359	$ 34,483
Basic earnings per share (in dollars per share)	$ 0.96	$ 0.95	$ 0.77	$ 1.83
Diluted earnings per share (in dollars per share)	$ 0.96	$ 0.94	$ 0.77	$ 1.82
Shares used in computing:
Basic earnings per share (in shares)	18,627	18,813	18,615	18,797
Diluted earnings per share (in shares)	18,683	18,992	18,659	18,996