Derivative Financial Instruments Schedule of Offsetting of Derivate Liabilities (Details) - USD ($) $ in Thousands	Jun. 28, 2015	Dec. 31, 2014
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	$ 2,213	$ 447
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of Liabilities Presented in the Balance Sheet	2,213	447
Financial Instruments	(509)	(447)
Cash Collateral Pledged	0	0
Net Amount	1,704	0
Barclays [Member]
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	437	16
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of Liabilities Presented in the Balance Sheet	437	16
Financial Instruments	(97)	(16)
Cash Collateral Pledged	0	0
Net Amount	340	0
J.P. Morgan Chase [Member]
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	349
Gross Amounts Offset in the Balance Sheet	0
Net Amounts of Liabilities Presented in the Balance Sheet	349
Financial Instruments	0
Cash Collateral Pledged	0
Net Amount	349
Wells Fargo Bank [Member]
Offsetting Liabilities [Line Items]
Gross Amounts of Recognized Liabilities	1,427	431
Gross Amounts Offset in the Balance Sheet	0	0
Net Amounts of Liabilities Presented in the Balance Sheet	1,427	431
Financial Instruments	(412)	(431)
Cash Collateral Pledged	0	0
Net Amount	$ 1,015	$ 0