Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Receivables and Assets (Details)

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Summary of Significant Accounting Policies - Receivables and Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 30, 2017
Mar. 31, 2016
Receivables    
Allowance for doubtful accounts $ 259 $ 149
Inventory Valuation and Shrinkage    
Inventory valuation reserves $ 2,239 $ 2,390
Vendor Relationships    
Goodwill and Other Indefinite-Lived Intangible Assets    
Useful Life 10 years  
Minimum | Furniture, fixtures and equipment    
Fixed Assets    
Useful life 2 years  
Minimum | Leasehold improvements    
Fixed Assets    
Useful life 10 years  
Minimum | Computer software and hardware    
Fixed Assets    
Useful life 3 years  
Maximum | Furniture, fixtures and equipment    
Fixed Assets    
Useful life 7 years  
Maximum | Leasehold improvements    
Fixed Assets    
Useful life 25 years  
Maximum | Computer software and hardware    
Fixed Assets    
Useful life 7 years