Derivative Financial Instruments Derivatives Designated as Cash Flow Hedges (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 28, 2014	Mar. 29, 2013	Dec. 31, 2013
Derivative [Line Items]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax	$ (85)	$ (179)
Interest Rate Swap [Member]
Derivative [Line Items]
Interest Rate Cash Flow Hedge Asset at Fair Value	302		276
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax	(85)	(179)
Minimum [Member]
Derivative [Line Items]
Derivative Liability, Notional Amount	70,000
Maximum [Member]
Derivative [Line Items]
Derivative Liability, Notional Amount	90,000
Other Liabilities [Member] | Interest Rate Swap [Member]
Derivative [Line Items]
Interest Rate Cash Flow Hedge Asset at Fair Value	$ 302		$ 276