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	$ 21,647	$ 28,606	$ 71,671	$ 85,400
Other comprehensive (loss) income, net of taxes:
Change in cumulative translation adjustment	(37,778)	17,126	(39,534)	7,773
Change in unrealized gain on available-for-sale securities	(52)	24	(12)	21
Change in minimum pension liability	45	(70)	78	(141)
Changes due to cash flow hedging instruments:
Net (loss) gain on hedge instruments	(5,475)	1,292	(7,250)	(563)
Reclassification to net income of previously deferred losses related to hedge derivatives instruments	2,534	(120)	4,163	506
Comprehensive (loss) income	$ (19,079)	$ 46,858	$ 29,116	$ 92,996