Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Sales	$ 544,662	$ 490,966	$ 1,050,383	$ 1,005,930
Cost of sales	496,749	456,294	960,243	927,897
Gross profit	47,913	34,672	90,140	78,033
Selling, general and administrative expenses	34,034	28,516	64,582	60,091
Amortization of intangible assets	1,599	2,371	3,197	4,752
Restructuring charges and other costs	1,581	5,657	3,172	8,572
Ransomware related incident costs (recovery), net	(0)	0	(3,444)	0
Income (loss) from operations	10,699	(1,872)	22,633	4,618
Interest expense	(2,079)	(2,351)	(4,228)	(4,053)
Interest income	164	287	329	886
Other income (expense)	440	32	164	(630)
Income (loss) before income taxes	9,224	(3,904)	18,898	821
Income tax expense (benefit)	1,855	(497)	3,612	376
Net income (loss)	$ 7,369	$ (3,407)	$ 15,286	$ 445
Earnings (loss) per share:
Basic	$ 0.21	$ (0.09)	$ 0.42	$ 0.01
Diluted	$ 0.20	$ (0.09)	$ 0.42	$ 0.01
Weighted-average number of shares outstanding:
Basic	35,753	36,439	36,000	36,614
Diluted	36,061	36,439	36,474	36,863