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Financial Instruments: Derivatives and Hedging (Details) (Interest Rate Swap, USD $)
0 Months Ended 6 Months Ended
Sep. 27, 2012
Jun. 30, 2013
Interest Rate Swap
   
Financial Instruments: Derivatives and Hedging    
Term pursuant to interest rate swap agreement 5 years  
Notional Value   $ 400,000,000
Strike Rate (as a percent)   0.75%
Fair Value   6,739,000
Unrealized gains or losses on derivative financial instruments in accumulated other comprehensive income   8,000,000
Amount estimated to be reclassified into earnings within next 12 months   1,600,000
Interest reclassified from accumulated other comprehensive income into interest expense   $ (1,100,000)