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Derivative and Hedging Activities (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 24, 2013
Sep. 30, 2014
Sep. 24, 2013
Dec. 31, 2013
Fair value of derivative instruments          
Fair value of Derivative Assets, Interest rate swaps $ 1,711,000   $ 1,711,000   $ 2,696,000
Fair value of Derivative Liabilities 1,711,000   1,711,000   2,696,000
Interest rate cash flow hedges          
Gain recognized in AOCI, net of tax (effective portion) 228,000 97,000 604,000 634,000  
Loss reclassified from AOCI to income (effective portion) 370,000 378,000 1,110,000 1,106,000  
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%    
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%