CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Net sales	$ 601,602	$ 614,680	$ 753,477
Cost of sales	428,586	438,424	583,274
Gross profit	173,016	176,256	170,203
Research and development expenses	30,917	31,450	29,412
Selling, general and administrative expenses	118,846	107,539	125,476
Operating income	23,253	37,267	15,315
Interest income (expense), net	(566)	(1,422)	(3,918)
Loss on sale of Argentina subsidiary	(6,050)	0	0
Accrued social insurance adjustment	0	9,464	0
Other income (expense), net	(557)	(1,404)	(995)
Income before provision for income taxes	16,080	43,905	10,402
Provision for income taxes	10,779	5,333	6,772
Net income	$ 5,301	$ 38,572	$ 3,630
Earnings per share:
Basic (in dollars per share)	$ 0.39	$ 2.78	$ 0.26
Diluted (in dollars per share)	$ 0.39	$ 2.72	$ 0.26
Shares used in computing earnings per share:
Basic (in shares)	13,465	13,893	13,879
Diluted (in shares)	13,742	14,166	14,109