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Long-term Debt (Details) (USD $)
6 Months Ended
Jul. 01, 2014
Dec. 31, 2013
Long-term Debt    
Long-term debt $ 50,873,000 $ 51,233,000
Less current maturities 113,000 243,000
Long-term debt, excluding current maturities 50,760,000 50,990,000
Installment loans, due 2014-2020
   
Long-term Debt    
Long-term debt 873,000 1,233,000
Weighted-average interest rate (as a percent) 10.46% 10.54%
Revolver
   
Long-term Debt    
Long-term debt 50,000,000 50,000,000
Weighted-average interest rate (as a percent) 3.96% 3.96%
Revolving credit facility, maximum borrowing capacity 200,000,000  
Revolving credit facility, amount outstanding 50,000,000  
Revolving credit facility, remaining borrowing capacity 144,600,000  
Letters of credit outstanding 5,400,000  
Revolving credit facility, fixed charge coverage ratio 2.00  
Revolving credit facility, leverage ratio 3.00  
Debt instrument condition for additional borrowing of secured debt, based on percentage of consolidated tangible net worth 15.00%  
Revolver | Minimum
   
Long-term Debt    
Percentage of commitment fee on unused credit facility 0.125%  
Revolver | Maximum
   
Long-term Debt    
Percentage of commitment fee on unused credit facility 0.30%  
Revolver | LIBOR
   
Long-term Debt    
Variable rate basis LIBOR  
Revolver | LIBOR | Minimum
   
Long-term Debt    
Interest rate added to base rate (as a percent) 0.875%  
Revolver | LIBOR | Maximum
   
Long-term Debt    
Interest rate added to base rate (as a percent) 1.875%  
Revolver | Prime Lending Rate
   
Long-term Debt    
Variable rate basis Prime Lending Rate  
Revolver | Federal Funds
   
Long-term Debt    
Variable rate basis Federal Funds  
Interest rate added to base rate (as a percent) 0.50%  
Revolver | Adjusted Eurodollar Rate
   
Long-term Debt    
Variable rate basis Adjusted 1 Month Eurodollar Rate  
Interest rate added to base rate (as a percent) 1.00%  
Revolver | Amendment option
   
Long-term Debt    
Revolving credit facility, maximum borrowing capacity 400,000,000  
Increase the revolving credit facility $ 200,000,000