Consolidated Statements of Comprehensive Income (Unaudited) (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	$ 14,945	$ 38,600	$ 84,108	$ 92,708
Other comprehensive income (loss):
Unrealized gains (losses) on hedging transactions, net of income taxes	4,352	(1,007)	5,741	345
Unrealized holding gains (losses) on investments, net of income taxes	240	433	736	(506)
Foreign currency translation adjustment	(191)	182	(387)	499
Comprehensive income	$ 19,346	$ 38,208	$ 90,198	$ 93,046