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Derivative and Hedging Activities (Details) (USD $)
 3 Months Ended 6 Months Ended
Jul. 01, 2014
Jun. 25, 2013
Jul. 01, 2014
Jun. 25, 2013
Dec. 31, 2013
Fair value of derivative instruments          
Fair value of Derivative Liabilities, Interest rate swaps $ 2,082,000   $ 2,082,000   $ 2,696,000
Fair value of Derivative Liabilities 2,082,000   2,082,000   2,696,000
Interest rate cash flow hedges          
Gain recognized in AOCI, net of tax (effective portion) 196,000 342,000 376,000 538,000  
Loss reclassified from AOCI to income (effective portion) 383,000 369,000 740,000 728,000  
Interest rate swap, entered October 22, 2008
          
Interest Rate Swaps          
Notional amount of interest rate swap 25,000,000   25,000,000    
Notional amount of hedge obligation 25,000,000   25,000,000    
Fixed interest rate of derivative (as a percent) 3.83%   3.83%    
Reference rate for interest receivable     one month LIBOR    
Interest rate swap, entered January 7, 2009
          
Interest Rate Swaps          
Notional amount of interest rate swap 25,000,000   25,000,000    
Notional amount of hedge obligation $ 25,000,000   $ 25,000,000    
Fixed interest rate of derivative (as a percent) 2.34%   2.34%    
Reference rate for interest receivable     one month LIBOR