Consolidated Statements of Earnings (Loss) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net Sales
Revenues	$ 470,483	$ 422,993	$ 396,679
Cost of Goods and Services Sold	305,510	282,562	256,251
Gross Margin	164,973	140,431	140,428
Selling, general and administrative expenses	73,569	71,943	61,624
Research and development expenses	25,304	25,146	24,040
Restructuring and impairment char	5,062	4,139	3,048
Gain (Loss) on Disposition of Property Plant Equipment	0	708	(11,450)
Operating earnings	61,038	38,495	63,166
Other (expense) income:
Interest expense	(2,085)	(3,343)	(3,702)
Interest income	1,826	1,284	1,305
Other (expense) income	(2,676)	3,817	(3,524)
Total other (expense) income, net	(2,935)	1,758	(5,921)
Earnings before taxes	58,103	40,253	57,245
Income tax expense	11,571	25,805	22,865
Net earnings	$ 46,532	$ 14,448	$ 34,380
Basic
Net earnings (loss) per share (usd per share)	$ 1.41	$ 0.44	$ 1.05
Diluted
Diluted net earnings (loss) per share (usd per share)	$ 1.39	$ 0.43	$ 1.03
Basic weighted-average common shares outstanding (in shares)	33,024	32,892	32,728
Effect of dilutive securities (in shares)	545	528	523
Diluted weighted - average common shares outstanding (in shares)	33,569	33,420	33,251