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Financial Instruments: Derivatives and Hedging (Details) (Cash flow hedges, USD $)
0 Months Ended 0 Months Ended 9 Months Ended
Aug. 26, 2013
2013 Interest Rate Swap
Sep. 30, 2013
2013 Interest Rate Swap
Sep. 27, 2012
2012 Interest Rate Swap
Sep. 30, 2013
2012 Interest Rate Swap
Financial Instruments: Derivatives and Hedging        
Term pursuant to interest rate swap agreement 7 years   5 years  
Notional Value   $ 220,000,000   $ 400,000,000
Strike Rate (as a percent)   2.32%   0.75%
Fair Value   (4,579,000)   4,365,000
Unrealized gains or losses on derivative financial instruments in accumulated other comprehensive income       1,000,000
Interest reclassified from accumulated other comprehensive income into interest expense       2,100,000
Amount estimated to be reclassified into earnings within next 12 months       $ 400,000