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Derivative and Hedging Activities (Details) (USD $)
3 Months Ended
Apr. 01, 2014
Mar. 26, 2013
Dec. 31, 2013
Fair value of derivative instruments      
Fair value of Derivative Liabilities, Interest rate swaps $ 2,402,000   $ 2,696,000
Fair value of Derivative Liabilities 2,402,000   2,696,000
Interest rate cash flow hedges      
Gain recognized in AOCI, net of tax (effective portion) 180,000 196,000  
Loss reclassified from AOCI to income (effective portion) 357,000 360,000  
Interest rate swap, entered October 22, 2008
     
Interest Rate Swaps      
Notional amount of interest rate swap 25,000,000    
Notional amount of hedge obligation 25,000,000    
Fixed interest rate of derivative (as a percent) 3.83%    
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    
Notional amount of hedge obligation $ 25,000,000    
Fixed interest rate of derivative (as a percent) 2.34%    
Reference rate for interest receivable 1-month LIBOR