Fair Value Measurements Derivative Instruments (Details) (USD $) In Thousands, unless otherwise specified						3 Months Ended		9 Months Ended
	Sep. 29, 2013 Swap [Member] Fair Value, Inputs, Level 2 [Member] Estimate of Fair Value, Fair Value Disclosure [Member]		Dec. 30, 2012 Swap [Member] Fair Value, Inputs, Level 2 [Member] Estimate of Fair Value, Fair Value Disclosure [Member]		Sep. 30, 2008 6.20% Senior Notes [Member]	Sep. 29, 2013 6.20% Senior Notes [Member] Interest Rate Swap [Member]	Sep. 30, 2012 6.20% Senior Notes [Member] Interest Rate Swap [Member]	Sep. 29, 2013 6.20% Senior Notes [Member] Interest Rate Swap [Member]	Sep. 30, 2012 6.20% Senior Notes [Member] Interest Rate Swap [Member]	Oct. 24, 2013 Subsequent Event [Member] 6.20% Senior Notes [Member] Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					6.20%
Derivative, Notional Amount						$ 225,000		$ 225,000		$ 225,000
Derivative Asset	4,123	[1]	8,169	[1]
Interest income on interest rate swaps						$ 1,429	$ 1,283	$ 4,319	$ 4,013

[1] The fair values were based on information provided by the bank counterparties that is model-driven and where inputs were observable or where significant value drivers were observable.