Consolidated Statements of Income - 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	$ 325,059	$ 269,059	$ 947,846	$ 835,266
Cost of sales	205,079	176,908	602,943	532,214
Selling and administrative expenses	76,271	60,908	230,271	212,380
Total operating costs and expenses	281,350	237,816	833,214	744,594
Operating income	43,709	31,243	114,632	90,672
Interest expense	4,027	3,701	12,443	11,924
Other expense (income), net	1,217	47	3,952	2,700
Income before income taxes	38,465	27,495	98,237	76,048
Income taxes	10,602	12,137	26,501	30,390
Net income	$ 27,863	$ 15,358	$ 71,736	$ 45,658
Per common share:
Basic (in dollars per share)	$ 0.55	$ 0.30	$ 1.41	$ 0.90
Diluted (in dollars per share)	$ 0.55	$ 0.30	$ 1.40	$ 0.89
Weighted average common shares outstanding:
Basic (in shares)	50,905,202	50,833,157	50,925,702	50,886,094
Diluted (in shares)	51,060,684	50,937,093	51,085,509	51,123,024