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Impact on Earnings from Interest Rate Swaps (Details) (Interest Rate Swap [Member], USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 30, 2013
Mar. 31, 2012
Other Comprehensive Income
   
Derivative Instruments, Gain (Loss) [Line Items]    
Gain/(loss) recognized in accumulated other comprehensive income $ (901) $ (451)
Interest Expense
   
Derivative Instruments, Gain (Loss) [Line Items]    
Gain/(loss) reclassified from accumulated other comprehensive income (effective portion) (391) (507)
Other Expense
   
Derivative Instruments, Gain (Loss) [Line Items]    
Gain/(loss) recognized in income (ineffective portion) $ (5) $ (1)