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 6 Months Ended
Jun. 28, 2014
Dec. 28, 2013
Jun. 28, 2014
Land
Dec. 28, 2013
Land
Jun. 28, 2014
Buildings and improvements
Dec. 28, 2013
Buildings and improvements
Jun. 28, 2014
Equipment (including computer software)
Dec. 28, 2013
Equipment (including computer software)
Jun. 28, 2014
Projects under construction
Dec. 28, 2013
Projects under construction
Jun. 28, 2014
Software development costs
Jun. 29, 2013
Software development costs
Jun. 28, 2014
Software development costs
Jun. 29, 2013
Software development costs
Property and equipment                            
Property plant and equipment, gross $ 25,924 $ 25,037 $ 1,140 $ 1,140 $ 3,281 $ 3,273 $ 21,412 $ 20,561 $ 91 $ 63        
Less accumulated depreciation and amortization (14,206) (13,613)                        
Property plant and equipment, net 11,718 11,424                        
Estimated useful life                         3 years  
Costs capitalized                     $ 52 $ 39 $ 74 $ 63