Stockholders' Equity (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013
Amounts Reclassified from AOCI
Interest expense	$ (768)	$ (813)	$ (2,346)	$ (2,486)
Interest income	231	129	733	616
Income before income taxes	9,109	9,783	38,905	48,325
Income tax benefit	(3,501)	(3,252)	(10,908)	(9,148)
Net income	5,608	6,531	27,997	39,177
Reclassifications From Accumulated Other Comprehensive Loss
Amounts Reclassified from AOCI
Income before income taxes	(142)	(96)	(428)	(186)
Income tax benefit	50	33	150	65
Net income	(92)	(63)	(278)	(121)
Unrealized Gain on Cash Flow Hedge | Reclassifications From Accumulated Other Comprehensive Loss
Amounts Reclassified from AOCI
Interest expense	(142)	(96)	(428)	(418)
Net Unrealized Losses on Available-For-Sale Securities | Reclassifications From Accumulated Other Comprehensive Loss
Amounts Reclassified from AOCI
Interest income				$ 232