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Financial Instruments: Derivatives and Hedging (Details) (USD $)
 3 Months Ended 9 Months Ended 0 Months Ended 1 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2011
Sep. 30, 2011
Sep. 27, 2012
Interest Rate Swap
Feb. 28, 2011
Interest Rate Swap
Sep. 30, 2012
Interest Rate Swap
Sep. 30, 2011
Interest Rate Swap
Dec. 31, 2011
Interest Rate Swap
Financial Instruments: Derivatives and Hedging              
Payment to terminate interest rate swap   $ 982,000   $ 983,000      
Interest amortization reclassified from accumulated other comprehensive income into interest expense           921,000,000 983,000,000
Effective portion of the loss on outstanding derivative recognized in Other Comprehensive Income           921,000,000 983,000,000
Term pursuant to interest rate swap agreement     5 years        
Notional Value         400,000,000    
Strike Rate (as a percent)         0.75%    
Fair Value         (1,671,000)    
Unrealized gains or losses on derivative financial instruments in accumulated other comprehensive income 385,000 921,000     1,700,000    
Amount estimated to be reclassified into earnings within next 12 months         $ 300,000