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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, 2014
2013 Interest Rate Swap
Sep. 27, 2012
2012 Interest Rate Swap
Sep. 30, 2014
2012 Interest Rate Swap
Sep. 30, 2014
2013 and 2012 Interest Rate Swaps
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   (4,847,000)   4,582,000  
Change in derivative financial instruments reported in other comprehensive income         3,500,000
Interest reclassified from accumulated other comprehensive income into interest expense         5,400,000
Amount estimated to be reclassified into earnings within next 12 months         $ 800,000