Stockholders' Equity (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2015	Jun. 28, 2014	Jul. 04, 2015	Jun. 28, 2014
Amounts Reclassified from AOCI
Interest expense	$ (728)	$ (780)	$ (1,473)	$ (1,578)
Income before income taxes	8,531	20,216	15,598	29,796
Income tax benefit	(956)	(5,937)	(1,645)	(7,407)
Net income	7,575	14,279	13,953	22,389
Reclassifications From Accumulated Other Comprehensive Loss
Amounts Reclassified from AOCI
Income before income taxes	(81)	(143)	(221)	(286)
Income tax benefit	28	50	78	100
Net income	(53)	(93)	(143)	(186)
Unrealized Gain on Cash Flow Hedge | Reclassifications From Accumulated Other Comprehensive Loss
Amounts Reclassified from AOCI
Interest expense	$ (81)	$ (143)	(211)	$ (286)
Net Unrealized Losses on Available-For-Sale Securities | Reclassifications From Accumulated Other Comprehensive Loss
Amounts Reclassified from AOCI
Interest income			$ (10)