Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement [Abstract]
Net sales	$ 2,250,587	$ 1,661,948	$ 1,356,362
Cost of goods sold	1,931,786	1,437,621	1,164,295
Gross profit	318,801	224,327	192,067
Selling, general and administrative expenses	284,010	249,809	176,362
Operating profit (loss)	34,791	(25,482)	15,705
Interest expense, net	6,083	3,860	3,180
Income (loss) from continuing operations before income taxes	28,708	(29,342)	12,525
Income tax expense (benefit)	11,115	(11,394)	5,490
Income (loss) from continuing operations	17,593	(17,948)	7,035
Loss from discontinued operations, net of taxes		(310)	(1,570)
Net income (loss)	$ 17,593	$ (18,258)	$ 5,465
Basic EPS:
Income (loss) from continuing operations	$ 1.49	$ (1.49)	$ 0.57
Loss from discontinued operations, net of taxes		(0.03)	(0.12)
Net income (loss)	1.49	(1.52)	0.45
Diluted EPS:
Income (loss) from continuing operations	1.40	(1.49)	0.55
Loss from discontinued operations, net of taxes		(0.03)	(0.13)
Net income (loss)	$ 1.40	$ (1.52)	$ 0.42
Weighted average number of common shares outstanding:
Basic	11,847,000	12,049,000	12,251,000
Diluted	12,528,000	12,049,000	12,881,000