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Equipment and Leasehold Improvements (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 24, 2016
Dec. 25, 2015
Equipment and leasehold improvements, gross $ 81,922 $ 76,845
Less: accumulated depreciation and amortization (24,764) (22,562)
Equipment and leasehold improvements, net 57,158 54,283
Land [Member]    
Equipment and leasehold improvements, gross $ 1,571 1,571
Buildings [Member]    
Useful Lives 20 years  
Equipment and leasehold improvements, gross $ 2,802 2,740
Machinery and equipment [Member]    
Equipment and leasehold improvements, gross $ 12,527 10,739
Machinery and equipment [Member] | Minimum [Member]    
Useful Lives 5 years  
Machinery and equipment [Member] | Maximum [Member]    
Useful Lives 10 years  
Computers, data processing and other equipment [Member]    
Equipment and leasehold improvements, gross $ 8,317 7,598
Computers, data processing and other equipment [Member] | Minimum [Member]    
Useful Lives 3 years  
Computers, data processing and other equipment [Member] | Maximum [Member]    
Useful Lives 7 years  
Leasehold improvements [Member]    
Equipment and leasehold improvements, gross $ 44,094 41,653
Leasehold improvements [Member] | Minimum [Member]    
Useful Lives 7 years  
Leasehold improvements [Member] | Maximum [Member]    
Useful Lives 22 years  
Furniture and fixtures [Member]    
Useful Lives 7 years  
Equipment and leasehold improvements, gross $ 2,356 1,488
Vehicles [Member]    
Equipment and leasehold improvements, gross $ 2,072 2,077
Vehicles [Member] | Minimum [Member]    
Useful Lives 5 years  
Vehicles [Member] | Maximum [Member]    
Useful Lives 7 years  
Other [Member]    
Useful Lives 7 years  
Equipment and leasehold improvements, gross $ 95 95
Construction-in-process [Member]    
Equipment and leasehold improvements, gross $ 8,088 $ 8,884