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
	Mar. 31, 2013	Apr. 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	$ 675	$ 1,409
Ineffective portion, amount of gains (losses) reclassified from other comprehensive earnings into earnings	(1)	(2)
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	341	1,266
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	(141)	142
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	475	1
Fair Value Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, (Gain) Loss Recognized in Income, Net	$ 3,107	$ 2,114