Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Statement [Abstract]
Net sales:	$ 1,032,578	$ 898,233	$ 837,097
Cost of sales	776,235	678,336	626,171
Gross profit	256,343	219,897	210,926
Selling, general, and administrative expense	149,153	139,085	128,233
Intangible asset impairment	0	0	1,552
Income from operations	107,190	80,812	81,141
Interest expense, net	703	2,323	10,709
Other (income) expense	(1,272)	408	3,309
Income before taxes	107,759	78,081	67,123
Provision for income taxes	24,468	18,153	13,011
Income from continuing operations	83,291	59,928	54,112
Discontinued operations:
(Loss) income before taxes	(16,602)	6,682	12,822
Provision for income taxes	2,123	1,519	3,125
(Loss) income from discontinued operations	(18,725)	5,163	9,697
Net income	$ 64,566	$ 65,091	$ 63,809
Net earnings per share – Basic:
Income from continuing operations (in dollars per share)	$ 2.55	$ 1.85	$ 1.69
(Loss) income from discontinued operations (in dollars per share)	(0.57)	0.16	0.31
Net income (in dollars per share)	$ 1.98	$ 2.01	$ 2.00
Weighted average shares outstanding – Basic (in shares)	32,664	32,389	31,979
Net earnings per share – Diluted:
Income from continuing operations (in dollars per share)	$ 2.53	$ 1.83	$ 1.66
(Loss) income from discontinued operations (in dollars per share)	(0.57)	0.16	0.30
Net income (in dollars per share)	$ 1.96	$ 1.99	$ 1.96
Weighted average shares outstanding – Diluted (in shares)	32,918	32,722	32,534