Stockholders' Equity (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012
Amounts Reclassified from AOCI
Interest expense	$ (842)	$ (33)
Income before income taxes	20,078	17,117
Income tax benefit	(44)	(2,797)
Net income	20,034	14,320
Losses on cash flow hedge | Reclassifications From Accumulated Other Comprehensive Loss
Amounts Reclassified from AOCI
Rent expense		(433)
Interest expense	(181)
Income before income taxes	(181)	(433)
Income tax benefit	63	152
Net income	$ (118)	$ (281)