Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Statement [Abstract]
Net Sales	$ 287,592	$ 215,401
Cost of sales	227,574	165,540
Gross profit	60,018	49,861
Selling, general, and administrative expense	47,203	37,084
Income from operations	12,815	12,777
Interest expense	444	44
Other expense	315	518
Income before taxes	12,056	12,215
Provision for income taxes	1,560	2,313
Income from continuing operations	10,496	9,902
Discontinued operations:
Income before taxes	2,570	2,830
Provision for income taxes	304	673
Income from discontinued operations	2,266	2,157
Net income	$ 12,762	$ 12,059
Net earnings per share – Basic:
Income from continuing operations (in dollars per share)	$ 0.32	$ 0.30
Income from discontinued operations (in dollars per share)	0.07	0.07
Net income (in dollars per share)	$ 0.39	$ 0.37
Weighted average shares outstanding -- Basic	32,771	32,586
Net earnings per share – Diluted:
Income from continuing operations (in dollars per share)	$ 0.32	$ 0.30
Income from discontinued operations (in dollars per share)	0.07	0.07
Net income (in dollars per share)	$ 0.39	$ 0.37
Weighted average shares outstanding -- Diluted	33,104	32,883