Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 28, 2014	Mar. 29, 2013
Income Statement [Abstract]
Sales	$ 144,224	$ 100,464
Cost of goods sold	120,913	86,641
Gross profit	23,311	13,823
Operating expenses:
Research and development	1,767	1,257
Sales and marketing	2,661	2,319
General and administrative	9,722	9,626
Total operating expenses	14,150	13,202
Income from operations	9,161	621
Interest and other income (expense), net	(629)	(957)
Income (loss) before provision (benefit) for income taxes	8,532	(336)
Income tax provision (benefit)	1,476	(25)
Net income (loss)	$ 7,056	$ (311)
Net income (loss) per share:
Basic	$ 0.24	$ (0.01)
Diluted	$ 0.24	$ (0.01)
Shares used in computing net income (loss) per share:
Basic	28,877	27,978
Diluted	29,918	27,978