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Acquisition (Details 2) (USD $) In Thousands, unless otherwise specified				6 Months Ended
	Jun. 29, 2013	Dec. 29, 2012	Jun. 29, 2013 WVFC	Jun. 29, 2013 Customer relationships WVFC	Jun. 29, 2013 Trademarks WVFC
Identified intangible assets acquired in the acquisition of WVFC
Intangible assets, net	$ 5,945	$ 2,010	$ 3,940	$ 3,200	$ 740
Estimated economic life of acquired intangible assets				10 years
Estimated amortization expense
2013				160
2014				320
2015				320
2016				320
2017				320
Thereafter				1,760
Total				$ 3,200