Condensed Consolidated Statements of Earnings - USD ($) $ 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	$ 197,869	$ 175,140	$ 585,890	$ 522,931
Cost of sales	136,935	118,772	406,782	355,852
Gross margin	60,934	56,368	179,108	167,079
Operating expenses:
Selling expenses	15,478	14,224	45,248	43,490
Research and development expenses	3,156	2,692	8,804	7,961
General and administrative expenses	9,787	10,424	31,375	33,405
Total operating expenses	28,421	27,340	85,427	84,856
Earnings from operations	32,513	29,028	93,681	82,223
Other expenses:
Interest expense, net	556	953	1,889	3,609
Other (income) expense, net	(128)	168	(295)	244
Total other expenses (income)	428	1,121	1,594	3,853
Earnings before income tax expense	32,085	27,907	92,087	78,370
Income tax expense	7,072	6,339	20,932	15,909
Net earnings	$ 25,013	$ 21,568	$ 71,155	$ 62,461
Net earnings per common share - basic (in dollars per share)	$ 0.78	$ 0.67	$ 2.21	$ 1.94
Net earnings per common share - diluted (in dollars per share)	$ 0.77	$ 0.66	$ 2.18	$ 1.92