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Long-term Debt (Details) (USD $)
3 Months Ended
Apr. 01, 2014
Dec. 31, 2013
Aug. 12, 2011
Long-term Debt      
Long-term debt $ 51,162,000 $ 51,233,000  
Less current maturities 240,000 243,000  
Long-term debt, excluding current maturities 50,922,000 50,990,000  
Installment loans, due 2014-2020
     
Long-term Debt      
Long-term debt 1,162,000 1,233,000  
Weighted-average interest rate (as a percent) 10.54% 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 contingent increase in maximum borrowing capacity 200,000,000   100,000,000
Revolving credit facility maximum borrowing capacity after contingent increase 400,000,000   300,000,000
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%