Consolidated Statements of Earnings - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement
Net Sales	$ 468,999	$ 470,483	$ 422,993
Cost of goods sold	311,424	305,510	282,562
Gross margin	157,575	164,973	140,431
Selling, general and administrative expenses	70,408	73,569	71,943
Research and development expenses	25,967	25,304	25,146
Restructuring charges	7,448	5,062	4,139
(Gain) loss on sale of assets	(63)	0	708
Operating earnings	53,815	61,038	38,495
Other (expense) income:
Interest expense	(2,648)	(2,085)	(3,343)
Interest income	1,737	1,826	1,284
Other (expense) income	(2,638)	(2,676)	3,817
Total other (expense) income, net	(3,549)	(2,935)	1,758
Earnings before taxes	50,266	58,103	40,253
Income tax expense	14,120	11,571	25,805
Net earnings	$ 36,146	$ 46,532	$ 14,448
Basic
Basic net earnings per share (usd per share)	$ 1.11	$ 1.41	$ 0.44
Diluted
Diluted net earnings per share (usd per share)	$ 1.09	$ 1.39	$ 0.43
Basic weighted-average common shares outstanding (in shares)	32,700	33,024	32,892
Effect of dilutive securities (in shares)	405	545	528
Diluted weighted - average common shares outstanding (in shares)	33,105	33,569	33,420