Quarterly report pursuant to Section 13 or 15(d)

Significant Accounting Policies (Details 2)

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Significant Accounting Policies (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 30, 2013
Dec. 29, 2012
Mar. 30, 2013
Land
Dec. 29, 2012
Land
Mar. 30, 2013
Buildings and improvements
Dec. 29, 2012
Buildings and improvements
Mar. 30, 2013
Equipment (including computer software)
Dec. 29, 2012
Equipment (including computer software)
Mar. 30, 2013
Projects under construction
Dec. 29, 2012
Projects under construction
Mar. 30, 2013
Software development costs
Mar. 31, 2012
Software development costs
Property and equipment                        
Property plant and equipment, gross $ 24,652 $ 24,790 $ 1,140 $ 1,140 $ 3,277 $ 3,429 $ 20,154 $ 20,158 $ 81 $ 63    
Less accumulated depreciation and amortization (12,706) (12,542)                    
Property plant and equipment, net 11,946 12,248                    
Estimated useful life                     3 years  
Costs capitalized                     $ 24 $ 49