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Derivative Financial Instruments Scheduel of Offsetting of Derivative Assets (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 30, 2014
Dec. 31, 2013
Offsetting of Derivative Assets [Line Items]    
Derivative Assets, Fair Value $ 261 $ 905
Derivative Asset, Fair Value, Amount Offset Against Collateral 0 0
Derivative Asset, Fair Value, Net 261 905
Derivative Asset, Fair Value, Gross Liability (261) (287)
Derivative, Collateral, Obligation to Return Cash 0 0
Derivative Asset 0 618
Barclays [Member]
   
Offsetting of Derivative Assets [Line Items]    
Derivative Assets, Fair Value 261 905
Derivative Asset, Fair Value, Amount Offset Against Collateral 0 0
Derivative Asset, Fair Value, Net 261 905
Derivative Asset, Fair Value, Gross Liability (261) (287)
Derivative, Collateral, Obligation to Return Cash 0 0
Derivative Asset 0 618
Wells Fargo Bank [Member]
   
Offsetting of Derivative Assets [Line Items]    
Derivative Assets, Fair Value 0 0
Derivative Asset, Fair Value, Amount Offset Against Collateral 0 0
Derivative Asset, Fair Value, Net 0 0
Derivative Asset, Fair Value, Gross Liability 0 0
Derivative, Collateral, Obligation to Return Cash 0 0
Derivative Asset $ 0 $ 0