CONDENSED CONSOLIDATED STATEMENTS OF (LOSS) EARNINGS - UNAUDITED - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Net sales	$ 122,382	$ 113,777	$ 380,394	$ 301,049
Cost of goods sold	76,720	76,871	244,446	204,677
Gross margin	45,662	36,906	135,948	96,372
Selling, general and administrative expenses	19,922	16,883	59,184	48,310
Research and development expenses	6,454	5,723	18,170	18,653
Restructuring charges	319	1,041	551	1,416
Operating earnings	18,967	13,259	58,043	27,993
Other (expense) income:
Interest expense	(514)	(857)	(1,577)	(2,617)
Interest income	230	217	689	852
Other (expense) income, net	(108,502)	1,617	(132,786)	(109)
Total other (expense) income, net	(108,786)	977	(133,674)	(1,874)
(Loss) earnings before income taxes	(89,819)	14,236	(75,631)	26,119
Income tax (benefit) expense	(25,923)	3,163	(24,600)	6,381
Net (loss) earnings	$ (63,896)	$ 11,073	$ (51,031)	$ 19,738
Loss (earnings) per share:
Basic	$ (1.97)	$ 0.34	$ (1.58)	$ 0.61
Diluted	$ (1.97)	$ 0.34	$ (1.58)	$ 0.61
Basic weighted – average common shares outstanding:	32,379	32,268	32,365	32,331
Effect of dilutive securities		241		270
Diluted weighted – average common shares outstanding:	32,379	32,509	32,365	32,601
Cash dividends declared per share	$ 0.04	$ 0.04	$ 0.12	$ 0.12