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Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 26, 2015
Dec. 27, 2014
Property and equipment      
Property and equipment, gross $ 118,600 $ 106,291  
Less accumulated depreciation and amortization (53,116) (46,328)  
Property and equipment, net 65,484 59,963  
Total cost of equipment and furniture and office equipment held under capital lease obligations 100 100  
Depreciation expense, including amortization of property under capital leases $ 6,994 6,958 $ 6,683
Minimum      
Property and equipment      
Useful Lives 2 years    
Maximum      
Property and equipment      
Useful Lives 30 years    
Building and Building Improvements [Member]      
Property and equipment      
Property and equipment, gross $ 22,453 22,922  
Building and Building Improvements [Member] | Minimum      
Property and equipment      
Useful Lives 20 years    
Building and Building Improvements [Member] | Maximum      
Property and equipment      
Useful Lives 30 years    
Equipment [Member]      
Property and equipment      
Property and equipment, gross $ 86,782 74,572  
Equipment [Member] | Minimum      
Property and equipment      
Useful Lives 7 years    
Equipment [Member] | Maximum      
Property and equipment      
Useful Lives 15 years    
Land [Member]      
Property and equipment      
Property and equipment, gross $ 1,001 1,001  
Vehicles [Member]      
Property and equipment      
Property and equipment, gross $ 238 387  
Vehicles [Member] | Minimum      
Property and equipment      
Useful Lives 4 years    
Vehicles [Member] | Maximum      
Property and equipment      
Useful Lives 5 years    
Furniture and Office Equipment [Member]      
Property and equipment      
Property and equipment, gross $ 8,126 $ 7,409  
Furniture and Office Equipment [Member] | Minimum      
Property and equipment      
Useful Lives 2 years    
Furniture and Office Equipment [Member] | Maximum      
Property and equipment      
Useful Lives 10 years