Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 28, 2014	Sep. 29, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 50,400	$ 20,727	$ 94,854	$ 53,130
Cash flows hedges [Abstract]
Change in net unrealized gain (loss), net of tax of $4 and $0 in the three-month periods and net of tax of ($2) and $0 in the nine-month periods, respectively	62	0	(173)	0
Reclassification adjustments for loss (gain) included in net income	44	0	101	0
Net change related to cash flow hedges	106	0	(72)	0
Available-for-sale investments
Change in net unrealized gain (loss), net of tax of ($49) and $152 in the three-month periods and net of tax of $133 and ($124) in the nine-month periods, respectively	(120)	764	1,441	(342)
Reclassification adjustments for loss (gain) included in net income	(45)	(20)	(651)	(103)
Net change related to available-for-sale investments	(165)	744	790	(445)
Currency translation adjustments [Abstract]
Change in currency translation adjustments, net of tax of $441 and $302 in the three-month periods and net of tax of $501 and $121 in the nine-month periods, respectively	(4,540)	1,626	(4,639)	(181)
Other comprehensive income (loss), net of tax	(4,599)	2,370	(3,921)	(626)
Total comprehensive income	$ 45,801	$ 23,097	$ 90,933	$ 52,504