CONDENSED CONSOLIDATED STATEMENTS OF EARNINGS - UNAUDITED - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Net sales	$ 128,427	$ 103,075
Cost of goods sold	85,836	70,176
Gross margin	42,591	32,899
Selling, general and administrative expenses	18,325	16,759
Research and development expenses	5,687	7,408
Restructuring charges	81	240
Operating earnings	18,498	8,492
Other (expense) income:
Interest expense	(555)	(851)
Interest income	202	331
Other expense, net	(3,356)	(1,982)
Total other expense, net	(3,709)	(2,502)
Earnings before income taxes	14,789	5,990
Income tax expense	2,799	2,182
Net earnings	$ 11,990	$ 3,808
Earnings per share:
Basic	$ 0.37	$ 0.12
Diluted	$ 0.37	$ 0.12
Basic weighted – average common shares outstanding:	32,319	32,466
Effect of dilutive securities	301	327
Diluted weighted – average common shares outstanding:	32,620	32,793
Cash dividends declared per share	$ 0.04	$ 0.04