Derivative Financial Instruments Schedule of Offsetting of Derivate Liabilities (Details) - USD ($) $ in Thousands	Sep. 27, 2015	Dec. 31, 2014
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	$ 678	$ 447
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of Liabilities Presented in the Balance Sheet	678	447
Financial Instruments	(356)	(447)
Cash Collateral Pledged	0	0
Net Amount	322	0
Barclays [Member]
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	372	16
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of Liabilities Presented in the Balance Sheet	372	16
Financial Instruments	(73)	(16)
Cash Collateral Pledged	0	0
Net Amount	299	0
J.P. Morgan Chase [Member]
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	23
Gross Amounts Offset in the Balance Sheet	0
Net Amounts of Liabilities Presented in the Balance Sheet	23
Financial Instruments	0
Cash Collateral Pledged	0
Net Amount	23
Wells Fargo Bank [Member]
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	283	431
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of Liabilities Presented in the Balance Sheet	283	431
Financial Instruments	(283)	(431)
Cash Collateral Pledged	0	0
Net Amount	$ 0	$ 0