Derivative Financial Instruments (Details 2) (USD $)	3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012
Derivative Instruments, Gain (Loss)
Reclassification of interest rate swap losses included in accumulated other comprehensive loss into earnings in the next 12 months	$ 500,000
Cash flow hedges | Interest rate swap
Derivative Instruments, Gain (Loss)
Gain (Loss) Recognized in OCI on Derivatives (Effective Portion) during period	44,000	(132,000)
Cash flow hedges | Interest rate swap | Rent expenses
Derivative Instruments, Gain (Loss)
Loss Reclassified from Accumulated OCI into Income (Effective Portion), included in rent expense during period		(433,000)
Cash flow hedges | Interest rate swap | Interest expense
Derivative Instruments, Gain (Loss)
Loss Reclassified from Accumulated OCI into Income (Effective Portion), included in rent expense during period	$ (181,000)