Consolidated Statements of Earnings - Unaudited - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Net sales	$ 103,075	$ 117,625
Cost of goods sold	70,176	77,010
Gross margin	32,899	40,615
Selling, general and administrative expenses	16,759	17,522
Research and development expenses	7,408	6,791
Restructuring charges	240	2,084
Operating earnings	8,492	14,218
Other (expense) income:
Interest expense	(851)	(466)
Interest income	331	432
Other (expense) income, net	(1,982)	96
Total other (expense) income. net	(2,502)	62
Earnings before income taxes	5,990	14,280
Income tax expense	2,182	2,861
Net earnings	$ 3,808	$ 11,419
Earnings per share:
Basic (in dollars per share)	$ 0.12	$ 0.35
Diluted (in dollars per share)	$ 0.12	$ 0.34
Basic weighted - average common shares outstanding (in shares):	32,466	32,807
Effect of dilutive securities (in shares)	327	463
Diluted weighted - average common shares outstanding (in shares)	32,793	33,270
Cash dividends declared per share (in dollars per share)	$ 0.04	$ 0.04