Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 29, 2013	Sep. 30, 2012	Sep. 29, 2013	Sep. 30, 2012
Statement of Comprehensive Income [Abstract]
Net income	$ 31,357	$ 29,748	$ 44,647	$ 79,351
Unrealized gain (loss) on available-for-sale securities, net of deferred tax	205	244	(755)	330
Total comprehensive income	$ 31,562	$ 29,992	$ 43,892	$ 79,681