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Derivative and Hedging Activities (Details) (USD $)
6 Months Ended
Jun. 28, 2011
Jun. 29, 2010
Dec. 28, 2010
Fair value of derivative instruments      
Fair value of Derivative Liabilities, Interest rate swaps $ 3,288,000   $ 2,178,000
Fair value of Derivative Liabilities 3,288,000   2,178,000
Interest rate cash flow hedges      
Interest rate swaps, Amount of Loss Recognized in AOCI (effective portion) (682,000) (1,735,000)  
Interest rate swap, entered October 22, 2008
     
Interest Rate Swaps      
Notional amount of interest rate swap 25,000,000    
Fixed interest rate of derivative (as a percent) 3.83%    
Notional amount of hedge obligation 25,000,000    
Reference rate for interest receivable 1-month LIBOR    
Interest rate swap, entered January 7, 2009
     
Interest Rate Swaps      
Notional amount of interest rate swap 25,000,000    
Fixed interest rate of derivative (as a percent) 2.34%    
Notional amount of hedge obligation $ 25,000,000    
Reference rate for interest receivable 1-month LIBOR