Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 37,332	$ 24,948	$ 65,344	$ 50,026
Other comprehensive income, net of taxes:
Change in cumulative translation adjustment	15,605	(1,863)	(39,024)	(1,756)
Change in unrealized (loss) gain on available-for-sale securities	(7)	39	48	40
Change in minimum pension liability	(18)	17	71	33
Changes due to cash flow hedging instruments:
Net loss on hedge instruments	(1,316)	(1,022)	(5,108)	(1,775)
Reclassification to net income of previously deferred losses related to hedge derivatives instruments	3,099	1,096	5,867	1,629
Comprehensive income	$ 54,695	$ 23,215	$ 27,198	$ 48,197