Derivative Financial Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 29, 2014	Jun. 30, 2013	Jun. 29, 2014	Jun. 30, 2013
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Effective portion, amount of gains (losses) reclassified from other comprehensive earnings into earnings	$ (143)	$ 851	$ (1,671)	$ 1,527
Ineffective portion, amount of gains (losses) reclassified from other comprehensive earnings into earnings	(3)	(67)	62	(68)
Cash Flow Hedging [Member] | Cost of Sales [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Effective portion, amount of gains (losses) reclassified from other comprehensive earnings into earnings	821	(306)	(198)	36
Cash Flow Hedging [Member] | Royalty Expense[Member] | Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Effective portion, amount of gains (losses) reclassified from other comprehensive earnings into earnings	(260)	97	(610)	(44)
Cash Flow Hedging [Member] | Sales [Member] | Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Effective portion, amount of gains (losses) reclassified from other comprehensive earnings into earnings	(704)	1,060	(863)	1,535
Fair Value Hedging [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) Recognized in Income, Net	$ 4,179	$ 3,197	$ 62	$ 90