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Derivative and Hedging Activities (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 25, 2013
Jun. 26, 2012
Jun. 25, 2013
Jun. 26, 2012
Dec. 25, 2012
Fair value of derivative instruments          
Fair value of Derivative Liabilities, Interest rate swaps $ 3,138,000   $ 3,138,000   $ 4,016,000
Fair value of Derivative Liabilities 3,138,000   3,138,000   4,016,000
Interest rate cash flow hedges          
Gain (Loss) recognized in AOCI, net of tax (effective portion) 342,000 (65,000) 538,000 (106,000)  
Gain (Loss) reclassified from AOCI to Income (effective portion) 369,000 363,000 728,000 718,000  
Interest rate swap, entered October 22, 2008
         
Interest Rate Swaps          
Notional amount of interest rate swap 25,000,000   25,000,000    
Fixed interest rate of derivative (as a percent) 3.83%   3.83%    
Notional amount of hedge obligation 25,000,000   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   25,000,000    
Fixed interest rate of derivative (as a percent) 2.34%   2.34%    
Notional amount of hedge obligation $ 25,000,000   $ 25,000,000    
Reference rate for interest receivable     1-month LIBOR