Consolidated Statement of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013
Statement of Comprehensive Income [Abstract]
Net Income	$ 9,406	$ 8,844	$ 33,161	$ 15,774
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Unrealized (loss) gain related to marketable securities, net	(210)	221	(280)	(11)
Realized gain on sale of auction rate securities, previously unrealized, net of tax	0	0	(1,147)	0
Less: reclassification adjustment for (gains) losses included in other income, net	(1)	1	98	303
Translation adjustment	(159)	225	579	(205)
Comprehensive income	$ 9,036	$ 9,291	$ 32,411	$ 15,861