Derivative Financial Instruments Schedule of Offsetting of Derivate Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Mar. 30, 2014	Dec. 31, 2013
Offsetting Liabilities [Line Items]
Derivative Liability, Fair Value, Gross Liability	$ 1,192	$ 381
Derivative Liability, Fair Value, Amount Offset Against Collateral	0	0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	1,192	381
Derivative Liability, Fair Value, Gross Asset	(261)	(287)
Derivative, Collateral, Right to Reclaim Cash	0	0
Derivative Liability	931	94
Barclays [Member]
Offsetting Liabilities [Line Items]
Derivative Liability, Fair Value, Gross Liability	1,192	287
Derivative Liability, Fair Value, Amount Offset Against Collateral	0	0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	1,192	287
Derivative Liability, Fair Value, Gross Asset	(261)	(287)
Derivative, Collateral, Right to Reclaim Cash	0	0
Derivative Liability	931	0
Wells Fargo Bank [Member]
Offsetting Liabilities [Line Items]
Derivative Liability, Fair Value, Gross Liability	0	94
Derivative Liability, Fair Value, Amount Offset Against Collateral	0	0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral	0	94
Derivative Liability, Fair Value, Gross Asset	0	0
Derivative, Collateral, Right to Reclaim Cash	0	0
Derivative Liability	$ 0	$ 94