Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Net sales	$ 301,629	$ 330,671
Cost of sales	194,696	208,248
Selling and administrative expenses	74,553	73,110
Total operating costs and expenses	269,249	281,358
Operating income	32,380	49,313
Interest expense	3,942	4,324
Other expense (income), net	1,463	1,594
Income before income taxes	26,975	43,395
Income taxes	7,593	13,662
Net income	$ 19,382	$ 29,733
Per common share:
Basic (in dollars per share)	$ 0.38	$ 0.58
Diluted (in dollars per share)	$ 0.38	$ 0.58
Weighted average common shares outstanding:
Basic (in shares)	50,933,666	51,061,132
Diluted (in shares)	51,087,688	51,501,857