Derivative Financial Instruments (Details 2) (USD $)	3 Months Ended		9 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011
Derivative Instruments, Gain (Loss)
Loss Reclassified from Accumulated OCI into Income (Effective Portion), included in rent expense during period	$ (900,000)
Reclassification of interest rate swap losses included in accumulated other comprehensive loss into earnings in the next 12 months	500,000		500,000
Cash flow hedges | Interest rate swap
Derivative Instruments, Gain (Loss)
Loss Recognized in OCI on Derivatives (Effective Portion) during period	(760,000)	(66,000)	(898,000)	(492,000)
Loss Reclassified from Accumulated OCI into Income (Effective Portion), included in rent expense during period	$ (1,317,000)	$ (481,000)	$ (2,197,000)	$ (1,777,000)