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Derivative Financial Instruments Scheduel of Offsetting of Derivative Assets (Details) - USD ($)
$ in Thousands
Sep. 27, 2015
Dec. 31, 2014
Offsetting of Derivative Assets [Line Items]    
Gross Amounts of Recognized Assets $ 537 $ 2,416
Gross Amounts Offset in the balance sheet 0 0
Net Amounts of Assets Presented in the Balance Sheet 537 2,416
Financial Instruments (356) (447)
Cash Collateral Pledged 0 0
Net Amounts 181 1,969
Barclays [Member]    
Offsetting of Derivative Assets [Line Items]    
Gross Amounts of Recognized Assets 73 319
Gross Amounts Offset in the balance sheet 0 0
Net Amounts of Assets Presented in the Balance Sheet 73 319
Financial Instruments (73) (16)
Cash Collateral Pledged 0 0
Net Amounts 0 303
Wells Fargo Bank [Member]    
Offsetting of Derivative Assets [Line Items]    
Gross Amounts of Recognized Assets 464 2,097
Gross Amounts Offset in the balance sheet 0 0
Net Amounts of Assets Presented in the Balance Sheet 464 2,097
Financial Instruments (283) (431)
Cash Collateral Pledged 0 0
Net Amounts $ 181 $ 1,666