Derivative Financial Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location (Details) (Foreign Exchange Forward [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jul. 01, 2012	Jun. 30, 2013	Jul. 01, 2012
Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Effective portion, amount of gains (losses) reclassified from other comprehensive earnings into earnings	$ 851	$ 1,895	$ 1,527	$ 3,304
Ineffective portion, amount of gains (losses) reclassified from other comprehensive earnings into earnings	(67)	16	(68)	14
Cash Flow Hedging [Member] | Cost of Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Effective portion, amount of gains (losses) reclassified from other comprehensive earnings into earnings	(306)	1,675	36	2,941
Cash Flow Hedging [Member] | Royalty Expense[Member]
Derivative Instruments, Gain (Loss) [Line Items]
Effective portion, amount of gains (losses) reclassified from other comprehensive earnings into earnings	97	864	(44)	1,006
Cash Flow Hedging [Member] | Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Effective portion, amount of gains (losses) reclassified from other comprehensive earnings into earnings	1,060	(644)	1,535	(643)
Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	$ 3,197	$ (646)	$ 90	$ 1,468